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Black Bean Aphid -2020
Sugarbeets Magic Valley
Black Bean Aphid
Posted on: July 31, 2020 by Jerry Neufeld
The Amalgamated Sugar Company field consultants are reporting that Black Bean Aphids have been found in sugarbeet fields near Hazelton, ID. Insecticides for Black Bean Aphid and Fungicides for Powdery Mildew can be tank mixed; however, TASCO has some concerns about the amount of water carrier used when these products are applied by air. TASCO asks that you contact your crop consultant if you have any application questions. Click on the link below for more information about Black Bean Aphid in the Pacific Northwest Insect Management Handbook.
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-aphid
Powdery Mildew, Cercospora Leaf Spot and Spider Mites near Twin Falls
Sugarbeets Magic Valley
Powdery Mildew, Cercospora Leaf Spot and Spider Mites
Posted on: July 22, 2020 by Jerry Neufeld
Powdery mildew and spider mites have been found by The Amalgamated Sugar Company LLC Crop Consultants in sugarbeet fields in the Twin Falls, ID area. There are several fungicides available for use to treat powdery mildew. Depending on the disease pressure and chemistry used, applications with different chemistries should be repeated every 14-21 days. Please be advised that strobilurins could show reduced efficacy due to fungicide resistance. Always tankmix with at least 5 lbs of sulfur for resistance management purposes.
TASCO is also reporting they have confirmed Cercospora leaf spot in a sugarbeet field near Twin Falls. We have reached critical temperatures but relative humidity is still low, however overhead irrigation can artificially increase relative humidity and therefore increase infection potential. Fields in close proximity to last year’s infected fields, or back to back sugarbeet fields are especially at risk. Please contact your local AMSCO agriculturist for fungicide recommendations based on last year’s fungicide resistance survey.
Contact your Crop Consultant from The Amalgamated Sugar Company LLC if you have any questions.
» https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-powdery-mildew
» https://pnwhandbooks.org/plantdisease/host-disease/sugar-beet-beta-vulgaris-cercospora-leaf-spot
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-spider-mite
Rupert Cereals Field Day - University of Idaho Cereal Extension Variety Trials
All Crops Magic Valley
Stripe rust, FHB, Take-all, Strawbreaker, Pythium, Rhizoc, Scald and any thing else you can think of
Posted on: July 12, 2019 by Juliet Marshall
JULY 16th. Rupert / Minidoka
Get the latest information on new releases of wheat and barley - both public and private varieties!
Bring your disease samples for diagnoses!
Join us for a great field day in Rupert next Tuesday morning!
Starting at Winter trials: Meridian Road north of Rupert at junction with 500 North on east side of road.
Spring trials ~700 N, 825 E
Lunch provided.
Contacts: Jason Thomas jasont@uidaho.edu 208-406-3571 or Jon Hogge (jhogge@uidaho.edu) or Juliet.Marshall@uidaho.edu
Idaho Potato psyllid monitoring update
All Crops Magic Valley
potato psyllid
Posted on: January 6, 2015 by Jerry Neufeld
All of the potato fields we have been monitoring have been vine killed. We are still monitoring a few harvested fields and our overwintering sites. In the coming weeks we will put together a summary of the monitoring results from this year.
Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0
Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0
More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
Twin Falls County Pest Abatement District
Announcements Magic Valley
Posted on: October 27, 2014 by Jerry Neufeld
Click on the pdf below if you are interested in applying to be on the Board of Trustees for the Twin Falls County Pest Abatement District.
Cercospora leaf spot in sugarbeets
Sugarbeets Magic Valley
Cercospora
Posted on: August 27, 2014 by Jeff Miller
Cercospora leaf spot has been confirmed in a sugarbeet field in Minidoka County. The recent wet weather has been favorable for disease development. The link below directs to an extension bulletin published by the University of Nebraska which discusses disease symptoms and fungicides which can be used for disease management.
Alfalfa cutworms
Alfalfa Magic Valley
Cutworms
Posted on: March 26, 2014 by Jeff Miller
Cutworm damage has been observed in newly seeded alfalfa in the Magic Valley. Details on this pest and control measures can be found by following the attached link.
Potato psyllids found in the Magic Valley
Potato Magic Valley
potato psyllids and ZC
Posted on: April 12, 2013 by Erik Wenninger
Several natural or semi-natural areas near Twin Falls are being monitored during the winter for potato psyllids. Sites were selected near watercourses where the alternative host plant bitter nightshade is found. Thus far, no psyllids have been found in direct inspection of plants; however, two adult potato psyllids were found on a yellow sticky trap near Shoshone Falls in late March. Whether these psyllids overwintered or have migrated to our area is unknown. They will be tested for liberibacter, the bacterium that causes ZC, and monitoring efforts will continue through the season. More information on potato psyllids and ZC can be found below.
Outback Steakhouse Gift Certificate Winners
All Crops Magic Valley
onion maggot
Posted on: March 26, 2013 by Jerry Neufeld
this is test
powdery mildew in sugarbeets
Sugarbeets Magic Valley
powdery mildew
Posted on: August 3, 2012 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Crop Consultants in sugarbeet fields in the Magic Valley of Idaho near Filer. Based on the early disease onset a protective fungicide application is suggested as well as continued scouting to assess disease development. There are several fungicides available for use to treat powdery mildew, including sulfur dusts. Click on the pdf below for recommendations from the 2012 PNW Plant Disease handbook. Depending on the disease pressure, applications with different chemistries should be repeated every 7 to 14 days. Contact your crop consultant from the Amalgamated Sugar Company if you have questions about treatment options.
Idaho potato psyllid update
Potato Magic Valley
potato psyllid
Posted on: July 13, 2012 by Erik Wenninger
A total of four adult potato psyllids was collected this week within U-Idaho’s potato psyllid sampling network throughout southern Idaho. One psyllid was collected on a yellow sticky trap from each of two grower fields in Twin Falls County. In addition, at the Kimberly Research & Extension Center, one psyllid was collected from a sticky trap and one was collected from a vacuum sample. These samples were sent to Moscow today to be tested for liberibacter. Obviously, numbers of psyllids continue to be rather low, and we still have yet to find potato psyllids of any life stage on potato plants themselves.
We continue to encourage scouting in order to make the most sound and appropriate management decisions for a given field.
Refer to the sites below for guidance on scouting and IPM programs for potato psyllids.
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Zebra chip pathogen confirmed in Idaho, and more Lso-positiv
Potato Magic Valley
potato psyllid & zebra chip
Posted on: July 9, 2012 by Erik Wenninger
Updated 8 July 2012
The potato psyllid sample from June 19 in Twin Falls County that tested positive for liberibacter, the zebra chip pathogen, was confirmed to be positive by gene sequencing. Samples from the following week (one from the Kimberly R&E Center and one from the same grower’s field in Twin Falls County) also have tested positive for liberibacter by PCR.
A few more adult potato psyllids (collected on July 3) have been found on yellow sticky traps in two different commercial potato fields in Twin Falls County, Idaho. These samples should be tested for liberibacter this week. Numbers of psyllids continue to be rather low (1 and 3 psyllids per field), and we have yet to find potato psyllids of any life stage on potato plants themselves, suggesting that colonization of fields has not yet occurred.
Field bindweed found harboring potato psyllid eggs in a grower’s field last week tested negative for PCR, which is consistent with studies by USDA-ARS, Wapato suggesting that field bindweed is not a host to Liberibacter. More field bindweed with potato psyllids was found along edges of a potato field in Gooding County, ID. Both eggs and early instar nymphs were found. Although reported to not be a host for liberibacter, this weed is a suitable host for potato psyllids. The importance of field bindweed and other alternate weed hosts of potato psyllids (e.g., nightshades) in facilitating spread of psyllids into potato fields remains to be explored, but good weed management might aid in psyllid management in potato.
We continue to encourage scouting in order to make the most sound and appropriate management steps for a given field.
Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://www.kimberly.uidaho.edu/potatoes/
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Zebra chip pathogen found in Idaho
Potato Magic Valley
potato psyllid & zebra chip
Posted on: July 2, 2012 by Erik Wenninger
Adult psyllids collected from a sticky card on a commercial field in Twin Falls County on June 19 have tentatively tested positive for Liberibacter, the bacterium that causes zebra chip. PCR tests conducted last week by Alex Karasev’s lab are being followed up this week by sequencing the bands to confirm that the sequences belong to Liberibacter. In the mean time, additional psyllids collected last week from this site and from the U-Idaho Kimberly R&E Center will be tested this week for Liberibacter.
We still have not found psyllids of any life stage on potato plants themselves. However, field bindweed was found along the edge of the field near the sticky card with “hot” psyllids, and today we found potato psyllid eggs (but no other life stages) on several field bindweed plants. The importance of this finding in relation to psyllid infestations in potato remains to be explored, but, considering potato psyllids have a broad host range that includes at least 20 plant families, weed management might aid in psyllid management in potato fields. The infested field bindweed also will be tested for Liberibacter.
This is the first (preliminary) finding of Liberibacter-infected psyllids in the Pacific Northwest this season; however, we still strongly recommend that fields be scouted in order to make the most sound and appropriate management steps for a given field.
Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://www.kimberly.uidaho.edu/potatoes/
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
More potato psyllids found in Idaho…
Potato Magic Valley
potato psyllid
Posted on: June 29, 2012 by Erik Wenninger
Updated 29 June 2012
Erik Wenninger, Nora Olsen, Phil Nolte, Mike Thornton, and Alex Karasev, in cooperation with Jeff Miller and Andy Jensen, are monitoring potato fields in Idaho for potato psyllids and Liberibacter, the bacterium that causes zebra chip (ZC). We found four adult potato psyllids on sticky cards that were collected on June 26 from a grower’s field in Twin Falls County. These were collected from the same site from which we collected two adult psyllids the previous week. We also found four adult potato psyllids on sticky cards that were collected on June 27 on bulk potatoes next to our insecticide trials at the Kimberly R&E Center. The samples are being shipped to campus to be tested for presence of Liberibacter. No potato psyllids were found this week at any of the other fields being monitored by our group in Idaho. Numbers of potato psyllids found are still low, and so far no immature potato psyllids have been found in leaf samples at any sites. We suggest that scouting programs in Idaho be intensified, and that IPM programs be ready. Samples can be taken to the Kimberly R&E Center for confirmation of potato psyllid identification. Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
http://www.potatoes.com/pdfs/PotatoPsyllid.pdf
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
More information on potato psyllids and zebra chip can be found here: http://www.kimberly.uidaho.edu/potatoes/
» http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
First potato psyllids found in a commercial field in Idaho…
Potato Magic Valley
potato psyllid
Posted on: June 26, 2012 by Erik Wenninger
Erik Wenninger, Nora Olsen, Phil Nolte, Mike Thornton, and Alex Karasev, in cooperation with Jeff Miller and Andy Jensen, are monitoring potato fields in Idaho for potato psyllids and Liberibacter, the bacterium that causes zebra chip (ZC). We found two adult potato psyllids on sticky cards that were collected on 19 June from a grower’s field in Twin Falls County. This is the first potato psyllid finding we are aware of from a commercial potato field in Idaho during 2012. The samples are being shipped to campus today to be tested for presence of Liberibacter. No potato psyllids were found from last week at any of the other fields being monitored by our group in Idaho. Numbers of potato psyllids found were very low. We suggest that scouting programs in Idaho be intensified, and that IPM programs be ready. Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
http://www.potatoes.com/pdfs/PotatoPsyllid.pdf
More information on potato psyllids and zebra chip can be found here:
http://www.kimberly.uidaho.edu/potatoes/
» http://www.kimberly.uidaho.edu/potatoes/
» http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
potato psyllid updates
All Crops Magic Valley
potato psyllid
Posted on: June 14, 2012 by Erik Wenninger
Updates on potato psyllids and ZC in the PNW
1. A single potato psyllid was found in each of two commercial fields in Oregon (Irrigon, OR on June 11 and Hermiston, OR on June 13). Both tested negative for Liberibacter, the pathogen that causes ZC. Numbers of potato psyllids in fields are very low. We suggest that scouting programs in Idaho be intensified, and that IPM programs be ready.
2. Surveys of emerged potato volunteers by Oregon State University in the Columbia Basin have reported ZC symptomatic plants that have tested positive for Liberibacter. Volunteers could be a source of the bacterium and efforts should be used to reduce volunteer populations in rotational crops. Closely monitor volunteers and submit any symptomatic plants for further analysis.
3. Potato psyllids were recently found on greenhouse-grown plants at garden centers in Boise and Twin Falls, ID. So far these psyllids have tested negative for Liberibacter. Potato psyllids are a difficult pest to manage in the greenhouse and have a broad host range, including common garden center plants like tomatoes and peppers, so these findings are not surprising. Potato psyllids have almost certainly occurred in greenhouses and garden centers in the PNW for many years. The relative importance of field infestations in the PNW originating from infested garden center plants, overwintering populations on weed hosts, and immigration from southern overwintering sites remains to be explored.
4. No potato psyllids have been found on potatoes in Idaho so far...
The take home message from all of these findings is that scouting programs for potato psyllids should be intensified, and IPM programs should be in place. Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
http://www.potatoes.com/pdfs/PotatoPsyllid.pdf
See this site for more psyllid links: http://www.kimberly.uidaho.edu/potatoes/
Stripe Rust
Small Grains Magic Valley
stripe rust
Posted on: May 30, 2012 by Jerry Neufeld
Strip rust was observed in the Magic Valley as of 5/28/2012 and confirmed on 5/30/2012 by Dr. Oliver T. Neher, University of Idaho. Infection was reported on winter wheat ‘Brundage’ planted the second week of September the previous year.
Resistant varieties should not need fungicide applications, but nevertheless, growers should scout all wheat fields as the prevalent strains of the fungi can change, affecting different varieties.
It is important to protect susceptible varieties with a fungicide as yield losses to this disease can be significant. Both strobilurin (Quadris, Headline) and triazole (Caramba, Tilt, Proline, Folicur, Prosaro) fungicides are equally effective in protecting against subsequent stripe rust infections, as are mixed mode-of-action fungicides (TwinLine, Quilt, Quilt Excel, Stratego). However, if stripe rust is currently in your crop, it is recommended that you include a triazole fungicide for the slightly curative activity. Fungicide ratings for stripe rust from the mid-west are: Excellent = azoxystrobin (Quadris), pyraclostrobin (Headline), metconazole (Caramba), tebuconazole (Folicur), and fungicide mixes rated Excellent for stripe rust includes prothioconazole and tebuconazole (both found in Prosaro), and the strobiluron / triazole mixes line, Twinline, Quilt or Quilt Xcel. Rated very good was propiconizole (Tilt), and the mix of propiconazole and trifloxystrobin (Stratego). This information is provided only as a guide. Other fungicides may also be labeled and effective against stripe rust. Inclusion in this list is not intended as a product endorsement and exclusion from this list is not meant to imply other products are ineffective.
Additional information and pictures are available on the Cereals Extension website for southern and southeast Idaho: http://www.extension.uidaho.edu/scseidaho/disease/disease_index.htm
sugarbeet root maggot
Sugarbeets Magic Valley
sugarbeet root maggot
Posted on: May 16, 2012 by Jerry Neufeld
The following information was provided by Dr. Erik J. Wenninger, Entomology and Extension Specialist with the University of Idaho at the Kimberly Research & Extension Center.
The degree day calculator (hosted by the Integrated Plant Protection Center at Oregon State University) for the sugar beet root maggot fly shows that—depending on your location in the Magic Valley—we have accumulated more than 360 degree days since March 1, 2012. Peak flight of root maggot flies should occur after 360 accumulated degree days when the maximum high temperature exceeds 80 degrees F. In the Mini-Cassia area, this usually occurs around the 2nd of June, but with warmer weather this year, peak flight in Rupert was predicted to have occurred on May 14.
Monitoring flies adjacent to your sugar beet fields using orange sticky stake traps will provide even more useful information regarding the local population densities of flies. The Amalgamated Sugar Company monitors flies with sticky stake traps throughout the Mini-Cassia area and posts the counts on their website: http://www.srcoop.com/ The economic threshold for application of granular insecticides against root maggots is an accumulative total of 40-50 sugar beet root maggot flies per sticky stake trap (the threshold varies depending on your contract price per ton). In the Mini-Cassia area, which historically has had high root maggot pressure, growers should consider an insecticide application 10 days before exceeding threshold captures on sticky stakes. Otherwise, insecticide applications should be made within 10 days before or after reaching the threshold (the closer to the threshold date, the better). Activation of granular insecticides should be accomplished by irrigation as soon after application as possible. See University of Idaho publication CIS 999, IPM Guide to Sugar Beet Root Maggot: http://www.uiweb.uidaho.edu/sugarbeet/insc/sbmaggot.htm
You can monitor degree day accumulation for sugarbeet root maggots as follows:
1) Log onto: http://uspest.org/cgi-bin/ddmodel.pl?spp=srm
2) Select “Sugarbeet Root Maggot Bechinski et al. 1990” degree day model from the “Select degree day model….” drop down box at the top of the form
3) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “RUPERT id agmet” in the “Washington, Idaho” box if you want information for a field near Rupert). Make sure to select “None” at the top of the lists in the other two location boxes.
4) Leave the “Or upload your own…” box blank
5) In the “Forecast:” area, enter your zip code or your city, state in the “NWS zipcode/city, state” box, or the location nearest your field from the “or weather.com site” drop down box to the right). This selection forecasts 7 days forward based on the local weather forecast (beyond 7 days the forecast is based on the historical average). The predicted date of peak fly flight will vary depending on the forecast location selected, so pick the one closest to your location. Select “none” to have the forecast based only on the historical average.
6) Select the location nearest your field in the “Select historical average forecast location” area. Your selection here should match, as close as possible, your selection in the “Select location” area above: there may not be an exact match. As above, select “none” in the other two boxes.
7) Make sure the “Table” and “graph” boxes are checked (and the “precipitation” if you want rainfall information) and click the “Calc” button. A table with the current degree day accumulations matching your selection should appear. There should also be a graph near the bottom showing the current year accumulation compared to the historical average for your selections.
clover root curculio in forage alfalfa
Alfalfa Magic Valley
clover root curculio
Posted on: May 3, 2012 by Jerry Neufeld
Below is information about Clover Root Curculio in forage alfalfa. The information is being provided by Dr. Erik Wenninger, UI Extension Entomologist and Dr. Glenn Shewmaker, UI Extension Forage Specialist. Both are located in Kimberly, Idaho.
There are a lot of questions about clover root curculio in forage alfalfa, but not a lot of information.Review the attached pdfs, especially the CRC fact sheet attached for more information. There isn’t a lot of new information about this pest, the entomologists who have worked on this have all retired.
Considerations for management of clover root curculio:
1. There are no registered pesticides for control of the larval stage of clover root curculio on alfalfa forage.
2. There are pesticides registered for use against adults on alfalfa forage, but adulticides are not likely to provide effective control because adults move readily among fields and are active over a long time period. The larval stage is most damaging.
3. Larvae produce the most damage and usually it is a year later that you see the symptoms in the early spring after alfalfa breaks dormancy.
4. Symptoms of CRC larval feeding damage are:
a. Patches of slow, dormancy-breaking alfalfa, sometimes related to irrigation management and drought. Drought exacerbates the water and nutrient uptake in alfalfa because of the trimming of fine roots in alfalfa and feeding on the nodules which reduces N fixation temporarily.
b. Individual weak plants with the patches, with some more healthy appearing plants side by side.
c. Scoring and girdling of alfalfa roots by the later stages of larvae.
5. Recommendations for control:
a. Since no pesticides are registered, we must rely on cultural control methods.
b. Rotation is the key method.
i). Rotation of an alfalfa field to a non-host crop (i.e., any crop other than alfalfa or clover) will eliminate larval food sources and discourage adults from laying eggs in the soil.
ii). New alfalfa fields should be planted as far away as possible from existing alfalfa fields, especially those with confirmed CRC infestations.
c. New plantings made during the spring may be less susceptible to CRC than those made during the fall, since many spring-planted alfalfa emerges towards the end of adult CRC activity, and should have a year of growth before it might be attacked by CRC larvae. Fall-planted alfalfa will have less time to mature before potential attack the following spring, and may also be more susceptible to possible attack by adults during fall establishment.
d. Our variety trials have not been directly assessed for CRC resistance, but most alfalfa breeders don’t think there are any resistant varieties identified, and no one seems to directly select for resistance to CRC.
e. Irrigation and fertility management will reduce the negative effects of CRC root damage. Although N application to provide N to nodule-affected plants is probably not economical since that condition seems to be very temporary.
f. The studies from Montana do not show consistent benefit from (UNREGISTERED FOR CRC) Furadan, although adult CRC numbers were reduced.
g. CRC larvae control would be difficult.
6. ID of adults and larvae
a. Damage by adults on the alfalfa leaves can be found occasionally, and relatively small numbers of adults have been found at Kimberly. Damage by adults is not likely to be economical unless heavy infestations attack newly planted alfalfa during the fall.
b. Larval damage has been observed throughout Idaho and extensively in the Kimberly area.
c. We have not been able to ID or find larvae in spring at Kimberly, although timing of looking for larvae and depth in the soil are a guess.
cutworms found in sugar beet
Sugarbeets Magic Valley
cutworms
Posted on: April 23, 2012 by Erik Wenninger
Heavy infestations of cutworms have been observed by Dave Scantlin (crop consultant, The Amalgamated Sugar Company) in sugar beet fields in Jerome, Wendell, and western Twin Falls County.
Cutworms generally are nocturnal, remaining by day just under the soil surface; often they are not seen until after the plant already has been damaged. Cutworm larvae are about 1 inch when mature and vary in color from light gray to dark brown, with faint stripes or fine mottles on their smooth, hairless, soft bodies. They curl into a motionless C-shape when disturbed. Subterranean species feed on roots and stems, cutting off plants at the soil surface. Climbing species hide during the day in soil and either cut off plants at the soil surface or feed in the crown on newest leaves and stems.
Scouting is easiest when done early in the morning. Lightly scrape the soil surface and look for larvae. No formal economic thresholds exist for cutworm insecticide treatment decisions in sugar beet. Infestations typically are very spotty, usually occurring near weedy patches or along field borders. Consider spot treating infested sites rather than the entire field.
Insecticide seed treatments may suppress cutworms, but will not control heavy infestations. For current information on registered insecticides, consult the Pacific Northwest Insect Management Handbook.
sugar beet root aphid
Sugarbeets Magic Valley
root aphid
Posted on: September 19, 2011 by Jerry Neufeld
Erik Wenninger, UI Entomology and Extension Specialist at the Kimberly R & E Center is reporting that sugar beet root aphids were observed in root samples taken last week from common lambsquarters in Kimberly. Sugar beet fields in Kimberly have not yet been thoroughly scouted, but at least some beets are expected to be infested. Overall root aphid numbers appear to be lower and infestations seem to have begun later than in previous years. Sugar beet root aphids may be pinhead sized and up to 5/64-inch (2 mm) long. They are pale whitish yellow and broadly oval to pear shaped. They secrete white, waxy strands, which give beets a distinctive “moldy” appearance. Severe infestations may reduce tonnage and sucrose levels. There are no rescue insecticide options available; when root aphids are found attacking beets, cultural control practices should be followed, the most important of which is to maintain optimum irrigation. For more information on identifying and managing sugar beet root aphids, see the following extension publication at the link below:
aphids in grain
Small Grains Magic Valley
aphids
Posted on: August 3, 2011 by Jerry Neufeld
The following information is provided by Dr. Erik Wenninger,Entomology and Extension Specialist, University of Idaho.
Numerous reports have been made in the past week of aphids in small grain crops from eastern Idaho. There are several aphid species that attack small grains, and there is considerable variation in body color even within species. A few samples have been identified as English grain aphids, but management practices generally will be similar for all aphid species. Treatment thresholds are an average of 2-10 aphids per tiller, per stem, or per head, PRIOR to dough stage. Insecticide applications after grain is in the milk stage of ripening are of no value. Most fields in eastern Idaho should be around the soft dough stage, and, therefore, insecticide treatment would not be economically justified. Of possible concern is the movement of these aphids onto potato fields where they may spread virus (see July 16 Pest Alert posting, reprinted below).
July 16 Pest Alert:
Aphids on potato are of concern only in regard to their transmission of plant viruses. Systemic insecticides are generally the most effective against aphids; however, use of insecticides may reduce, but will not eliminate spread of viruses. There are no well-established treatment thresholds for aphids in potato. Consult the PNW Insect Management Handbook (http://pnwpest.org/pnw/insects) for registered products. Consult CIS 1165 (http://www.cals.uidaho.edu/edComm/detail.asp?IDnum=1535) by Nolte, Alvarez, and Whitworth for more detailed recommendations on management of aphid vectors of potato virus, including insecticide recommendations.
Green peach aphids in potato
Potato Magic Valley
Green peach aphid
Posted on: July 22, 2011 by Jeff Miller
Green peach aphids have been found in potatoes in the Rupert/Burley area. See the PNW Pestalert posting on July 16 for more information on aphid management.
Black Bean Aphid
Sugarbeets Magic Valley
Black Bean Aphid
Posted on: July 20, 2011 by Jerry Neufeld
Dr. Erik J. Wenninger, Entomology and Extension Specialist with the University of Idaho at the Kimberly R and E Center is reporting that Black Bean Aphids have been observed in sugar beet fields at the U-Idaho Kimberly R & E Center. The black bean aphid is a dark-bodied aphid, about 1/16-inch long; individuals may be winged or wingless. So far primarily winged individuals have been found, but they will soon produce colonies of wingless aphids on beets. Aphids may be found on the young leaves within the crown of sugar beets. Infestations usually occur as scattered hot spots or along edges rather than uniformly across the entire field. Colonies can produce massive amounts of honeydew, which may result in black, sooty mold covering the leaves.
Aphids are attacked by a large variety of predatory and parasitic insects. We do not yet know enough about arthropod natural enemies to suggest practical ways of manipulating and enhancing their effects other than avoiding any unnecessary insecticide applications. See the Extension publication PNW 343, Beneficial Insects Associated with Pacific Northwest Crops, for descriptions of common natural enemies.
If natural enemies are absent, consider an insecticide application if bean aphids are on most leaves and if colonies cover 20 to 40 percent of leaf surfaces. When scouting a field, it is important to sample plants in several representative areas across a field, because infestations may be patchy. It is advisable to also assess natural enemy populations at this time when making a decision on whether to apply insecticides. In addition to sugar beets, black bean aphids may be found in other crops, including beans and corn.
For current information on registered insecticides and other information about black bean aphids click on the links below.
» http://uspest.org/pnw/insects
Green Peach Aphid
Potato Magic Valley
Aphids in Potatoes
Posted on: July 16, 2011 by Tony McCammon
Green peach aphids were observed in Kimberly this week. Aphids on potato are of concern only in regard to their transmission of plant viruses. Systemic insecticides are generally the most effective against aphids; however, use of insecticides may reduce, but will not eliminate spread of viruses. There are no well-established treatment thresholds for aphids in potato. Consult the PNW Insect Management Handbook (http://pnwpest.org/pnw/insects) for registered products. Consult CIS 1165 (http://www.cals.uidaho.edu/edComm/detail.asp?IDnum=1535) by Nolte, Alvarez, and Whitworth for more detailed recommendations on management of aphid vectors of potato virus, including insecticide recommendations.
Early blight
Potato Magic Valley
Early blight
Posted on: July 15, 2011 by Jeff Miller
Early blight lesions have been found on the lower leaves of both Russet Burbank and Western Russet. Fungicide applications for early blight/brown leaf spot control should be made at this time if they have not already been initiated.
Several products are effective for control of early blight such as Endura, QoIs (Gem, Tanos, Headline, Quadris, Reason), and products with difenoconazole (Revus Top, Quadris Top, and Omega Top). These products should be tank-mixed with a standard protectant such as a chlorothalonil or EBDC product. Reduced sensitivity has been found with Endura, Quadris, and Headline in the early blight pathogen population. In a trial sponsored by the Idaho Potato Commission and industry in 2010 Gem and Tanos showed greater disease control than Headline and Quadris. We believe all these products are still useful and provide value, but should be used with a protectant.
The standard protectant (chlorothalonil or EBDC) will provide good protection against late blight. In our semiarid environment, the standard protectants have resulted in very good late blight control when applied before an outbreak has occurred. Our research has shown that repeated use of the same protectant will build fungicide residue in the potato canopy. (Standard protectants have a broad spectrum of activity and the risk of resistance developing due to repeated use is very low.) Endura is not effective against late blight, and most QoI products need to be applied at higher rates (relative to early blight) to provide late blight protection. Revus Top and Tanos both have active ingredients effective against late blight. Gavel is also very effective against late blight and has an EBDC component to provide protection against early blight. A more detailed discussion of different fungicides effective against late blight can be found at the link below.
Applications should be made on a 10-14 day schedule during this time of rapid vine growth. Recent thundershowers have also made the environment favorable for both early and late blight development.
We have published a discussion of products, application methods, and application intervals at the link provided below.
» http://www.millerresearch.com/reports/LateBlight/Overview_of_Fungicides_for_Late_Blight.pdf
Colorado Potato Beetle
Potato Magic Valley
Colorado Potato Beetle
Posted on: June 14, 2011 by Jerry Neufeld
Dr. Erik Wenninger, Extension Entomology Specialist with UI-CALS in Kimberly is reporting that Colorado potato beetles were observed in Kimberly late last week. So far, only overwintered adults have been observed, and they will do little damage to potatoes. Scouting should begin soon for eggs and for larvae, which can cause considerable damage.
To guard against development of insecticide resistance, post-emergence applications of neonicotinoid insecticides should not be used if a neonicotinoid seed treatment or other at-planting neonicotinoid treatment was used. Examples of neonicotinoid seed or at-planting treatments include Admire, Belay, Cruiser, Gaucho, and Platinum. Examples of foliar neonicotinoid sprays include Actara, Belay, Endigo ZC, Leverage, and Provado.
Those using “soft” chemistries against Colorado potato beetles should be especially vigilant about scouting to appropriately time sprays. Sprays against the first generation should be applied when the first mature larvae are seen; at this time most of the larvae have hatched, but are still relatively small and susceptible to insecticides.
Border sprays may be considered if populations have not spread into the interior of fields.
stripe rust
Small Grains Magic Valley
stripe rust
Posted on: June 2, 2011 by Jerry Neufeld
Dr. Oliver Neher from the UI Twin Falls R and E Center is reporting that stripe rust has been confirmed in small grains near Hanson. Some fungicides can’t be applied after heading and some can be applied up until flowering. In all cases apply according to the label.
Cereal Schools for Southern Idaho, Feb 1, 2011
Small Grains Magic Valley
Posted on: January 17, 2011 by Juliet Marshall
Cereal School Agenda will include variety updates, insect and disease information, and fertility management for high protein grain. Hope to see you there!
Burley, Burley Inn, Contact Joel Packham 878-9461
sugarbeet root aphids
Sugarbeets Magic Valley
sugarbeet root aphids
Posted on: August 20, 2010 by Jerry Neufeld
UI Extension Entomologist Erik Wenninger is reporting that sugar beet root aphids have been observed on the roots of common lambsquarters within sugar beet fields in Kimberly. Aphids have not yet been observed on adjacent beets, but they are expected to move to beets soon. Sugar beet root aphids may be pinhead sized and up to 5/64-inch (2 mm) long. They are pale whitish yellow and broadly oval to pear shaped. They secrete white, waxy strands, which give beets a distinctive “moldy” appearance. Severe infestations may reduce tonnage and sucrose levels. There are no rescue insecticide options available; when root aphids are found attacking beets, cultural control practices should be followed (see below).
Sugar beet root aphids feed on the roots of sugar beet plants, but will also attack closely related species, including spinach, table beets, common lambsquarters, and pigweed. Pulling alternate weed hosts found within or adjacent to sugar beet fields and inspecting the roots for aphids and distinctive wax secretions may be a convenient method of preliminary scouting. If aphids are found on weeds, then nearby sugar beets should be examined as well.
When root aphid infestations are found on sugar beets, careful maintenance of a proper irrigation schedule is the single most important cultural control tool available. Damage by root aphids is exacerbated when plants are drought stress (conversely, diseases are encouraged when plants are over irrigated), so an optimal irrigation schedule will enhance the ability of the crop to resist attack from aphids. In addition, good management of alternate weed hosts (including lambsquarters, dock, pigweed, and prostrate knotweed) is important, and care should be taken to avoid contaminating uninfested fields with soil or irrigation water from an infested field. The use of resistant sugar beet varieties may be considered for future plantings.
Black Bean Aphids
Sugarbeets Magic Valley
Black Bean Aphid
Posted on: August 10, 2010 by Jerry Neufeld
UI Extension Entomologist Erik Wenninger is reporting sporadic black bean aphid infestations have been observed in several sugar beet fields across the Magic Valley. The black bean aphid is a dark-bodied aphid, about 1/16 inch long; individuals may be winged or wingless. Aphids may be found on the young leaves within the crown of sugar beets. Infestations usually occur as scattered hot spots or along edges rather than uniformly across the entire field. Colonies can produce massive amounts of honeydew, which causes a black, sooty mold to cover the leaves.
There are no formal economic thresholds for insecticide treatment decisions for bean aphids, but treatment should be considered if fields are under heavy pressure. When scouting a field, it is important to sample plants in several representative areas across a field, because infestations may be patchy. Also, several predators (notably, lady beetles) and parasites attack bean aphids and may effectively suppress aphid populations. Therefore, it is advisable to assess natural enemy populations when making a decision on whether to apply insecticides.
In addition to sugar beets, black bean aphids may be found in other crops, including beans and corn.
For current information on registered insecticides, consult the Pacific Northwest Insect Management Handbook (http://uspest.org/pnw/insects).
UI CALS Twilight Tour
Announcements Magic Valley
Posted on: July 9, 2010 by Jerry Neufeld
Attached is a flyer with information about the July 21 UI CALS Twilight Tour at the Kimberly R and E Center.
Loose Smut on Wheat
Small Grains Magic Valley
Loose Smut
Posted on: June 25, 2010 by Jerry Neufeld
Loose smut on wheat was observed in Jerome County. Infected heads are blackened (picture 1) and spikelets are transformed into dry, olive-black masses of spores (pictures 2 & 3). Spores are spread by wind or splashing rain. Only a bare rachis will remain. Before heading, infected plants might have dark green, erect leaves with possible chlorotic streaks. Fungus survives in infected seeds, which remain fully germinable and are not visibly altered. Control is only possible by planting certified disease free seeds, resistant cultivars, and chemical seed treatments.
This information was provided by UI Extension Plant Pathologist Dr. Oliver Neher.
Downey MIldew
Alfalfa Magic Valley
Downey MIldew
Posted on: June 21, 2010 by Jerry Neufeld
Downey Mildew on Alfalfa was observed in the Rupert area. Cool and humid conditions are conducive to the development and spread of Downy Mildew. Initial symptoms include chlorotic tissue either as localized areas on leaflets or entire leaves and stems if infection is progressing. Infected leaves can show symptoms of twisting and/or curling of the leaf margin. Lower leaf surfaces will show white to pale violet down growth. Fungus needs near 100% relative humidity to reproduce and is spread primarily by wind and splashing rain. Disease cycle can be repeated every 5 days depending on environmental conditions. Please consult the PNW handbook pdf below for control alternatives.
This information was provided by UI Extension Plant Pathologist Dr. Oliver Neher.
Sugarbeet Leafminer
Sugarbeets Magic Valley
Leafminer
Posted on: June 10, 2010 by Jerry Neufeld
Heavy leafminer activity has been observed in several sugar beet fields across the Magic Valley. Maggots feed between the upper and lower leaf surfaces, leaving irregular transparent windows, blotches, and winding tunnels. Eggs are tiny, white, and cigar shaped and are laid on the underside of leaves and cotyledons; they may be laid singly or in groups of two or more. Eggs may be readily observed without magnification. Under very warm conditions, eggs may hatch within four days, but will take longer to hatch under the cooler conditions that we have experienced this spring. There are no formal economic thresholds for insecticide treatment decisions for leafminers, but treatment should be considered if fields are under heavy pressure. To scout a field, sample ten plants in each of several representative areas across a field. Record the average number of eggs and mines per plant observed in each area. Foliar insecticides should be considered within a few days after the first appearance of mines or before most eggs have hatched. Alternatively, systemic granular insecticide should still be effective if applied (and activated) shortly after most larvae have tunneled into leaves. Insecticide seed treatment should also provide control against early-season leafminer attack, which is expected to be more damaging than later-season attack. For current information on registered insecticides, consult the Pacific Northwest Insect Management Handbook (http://uspest.org/pnw/insects).
This information was provided by Dr. Erik Wenninger, UI Extension Entomology Specialist.
» http://uspest.org/pnw/insects
sugatbeet root maggot
Sugarbeets Magic Valley
sugarbeet root maggot
Posted on: May 25, 2010 by Jerry Neufeld
The degree day calculator (hosted by the Integrated Plant Protection Center at Oregon State University) for the sugarbeet root maggot fly shows that—depending on your location in the Magic Valley—we have accumulated about 237 degree days since March 1, 2010. Peak emergence of root maggot flies should occur around 350 accumulated degree days when the maximum high temperature exceeds 80 degrees F. In the Mini-Cassia area, this usually occurs around the 2nd of June. With recent temperatures being cooler than average, peak flight should occur slightly later (around the 5th of June in the Rupert area).
Monitoring flies adjacent to your sugar beet fields using orange sticky stake traps will provide even more useful information regarding the local population densities of flies. The Amalgamated Sugar Company monitors flies with sticky stake traps throughout the Mini-Cassia area and posts the counts on their website: http://www.srcoop.com/ The economic threshold for application of granular insecticides against root maggots is an accumulative total of 40-50 sugarbeet root maggot flies per sticky stake trap (the threshold varies depending on your contract price per ton). In the Mini-Cassia area, which historically has had high root maggot pressure, growers should consider an insecticide application 10 days before exceeding threshold captures on sticky stakes. Otherwise, insecticide applications should be made within 10 days before or after reaching the threshold (the closer to the threshold date, the better). Activation of granular insecticides should be accomplished by irrigation as soon after application as possible. See University of Idaho publication CIS 999, IPM Guide to Sugar Beet Root Maggot: http://www.uiweb.uidaho.edu/sugarbeet/insc/sbmaggot.htm
You can monitor degree day accumulation for sugarbeet root maggots as follows:
1) Log onto: http://uspest.org/cgi-bin/ddmodel.pl?spp=srm
2) Select “Sugarbeet Root Maggot Bechinski et al. 1990” degree day model from the “Select degree day model….” drop down box at the top of the form
3) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “RUPERT id agmet” in the “Washington, Idaho” box if you want information for a field near Rupert). Make sure to select “None” at the top of the lists in the other two location boxes.
4) Leave the “Or upload your own…” box blank
5) In the “Forecast:” area, enter your zip code or your city, state in the “NWS zipcode/city, state” box, or the location nearest your field from the “or weather.com site” drop down box to the right). This selection forecasts 7 days forward based on the local weather forecast (beyond 7 days the forecast is based on the historical average). The predicted date of peak fly flight will vary depending on the forecast location selected, so pick the one closest to your location. Select “none” to have the forecast based only on the historical average.
6) Select the location nearest your field in the “Select historical average forecast location” area. Your selection here should match, as close as possible, your selection in the “Select location” area above: there may not be an exact match. As above, select “none” in the other two boxes.
7) Make sure the “Table” and “graph” boxes are checked (and the “precipitation” if you want rainfall information) and click the “Calc” button. A table with the current degree day accumulations matching your selection should appear. There should also be a graph near the bottom showing the current year accumulation compared to the historical average for your selections.
This information is provided by Dr. Erik J. Wenninger, UI Extension Entomology Specialist in Twin Falls.
bacterial blight in barley
Small Grains Magic Valley
bacterial blight
Posted on: May 25, 2010 by Jerry Neufeld
UI Extension Plant Pathologist Oliver Neher is reporting that bacterial blight has been found in barley in the Paul area (Magic Valley). Bacterial blight is favored by several factors including high moisture (rain or irrigation), cool temperatures, and mechanical damage such as equipment or wind which transports sediment. There are no products labeled to treat bacterial diseases. About the only practical treatment a grower can employ is to reduce moisture (irrigation) if bacterial blight is found in your fields. Click on the pdf below for images of bacterial blight.
Aberdeen Small Grains Field Day
Small Grains Magic Valley
Posted on: July 14, 2009 by Juliet Windes
A Small Grains Field Day will be held at the Aberdeen R&E Center, Wednesday, July 15th, starting at 9:00 AM. There will be no cost associated with attendance. Wheat breeders Dr. Jianli Chen and Dr. Bob Zemetra will be on hand to discuss the wheat breeding programs, and Dr. Juliet Windes will tour the extension variety and specialty trials. Lunch will be provided. Call 208-529-8376 for additional information.
Colorado Potato Beetles in Magic Valley
Potato Magic Valley
Posted on: June 1, 2009 by Nora Olsen and Jeff Miller
Overwintering Colorado Potato Beetle adults are beginning to emerge in southcentral Idaho-- both Eastern and Western Magic Valley. Confirmed areas include Rupert, Minidoka, and Twin Falls.
The overwintering adult stage does limited damage, however, females are beginning to lay eggs in potato fields. We could see the damaging larvae appear in about 7 to 10 days depending on temperatures. Growers that did not apply an effective systemic insecticide at planting should be watching for the egg hatch to time a foliar spray for the first generation of CPB larvae.
Cereal leaf beetle
Small Grains Magic Valley
Posted on: May 14, 2009 by Jeff Miller
Cereal leaf beetle have been found in wheat and barley near the desert east of Minidoka. See the May 12 posting for photos and a link to the University of Idaho CIS article.
cereal leaf beetle
Small Grains Magic Valley
Posted on: May 12, 2009 by Jerry Neufeld
Kerry Bowen is reporting that many cereal leaf beetle are being found in the Declo area up against the mountains. Click on the pdf below for CLB control information from the 2009 Pacific Northwest Insect Management Handbook. The following link will take you to a University of Idaho publication with more information (including images)about the CLB: http://info.ag.uidaho.edu/Resources/PDFs/CIS0994.pdf.
Cereal Schools for Southeast Idaho
Small Grains Magic Valley
Posted on: February 2, 2009 by Juliet Windes
2008 Eastern Idaho Cereal Schools
Burley Feb 3, 8:30 AM at McGregor Center / Minidoka Extension Office
Pocatello Feb 4, 8:30 AM Registration, at the Holiday Inn, 1399 Bench Road
Idaho Falls Feb 5, 8:30 AM Registration, Red Lion Inn, 475 River Parkway
Ashton Feb 5, 9:30 AM Registration, Trails Inn, 213 Main Street
Preston Feb 6, 8:30 AM Registration, Robinson Building, Fairgrounds
See http://www.ag.uidaho.edu/scseidaho/Upcoming_events/Upcoming_events_index.htm for further information.
Test Potato Alert Part 2
All Crops Magic Valley
Posted on: January 26, 2009 by Matt Goodale
This is a test alert. Please disregard this message.
Test Test
Colorado potato beetle larvae
Potato Magic Valley
Posted on: June 30, 2008 by Jeff Miller
Colorado potato beetle larvae are now emerging from eggs in the Rupert area. Growers who have not put on an at-planting insecticide need to apply a foliar insecticide.
Leaf miners in sugarbeets
Sugarbeets Magic Valley
Posted on: June 16, 2008 by Steve Hines
Leaf miners have been found in sugar beets in the MiniCassia area. Mainly in larger beets. If you have questions, call your Almagameted Sugar fieldman.
Test Alert
All Crops Magic Valley
Posted on: May 13, 2008 by Matt Goodale
Test alert - please disregard. The system is undergoing testing at the moment.
Burley Cereal School
Announcements Magic Valley
Posted on: January 28, 2008 by Juliet Windes
Don't forget the Burley Cereal School scheuled for tomorrow, January 29, 2008. For the entire agenda, see our website and click on "Upcoming Events." http://www.ag.uidaho.edu/scseidaho/
Registration is at 8:30 AM, at the Burley Inn, Exit 208, 800 N. Overland Ave. A $10 registration fee will help offset the cost of lunch.
powdery mildew
Sugarbeets Magic Valley
Posted on: July 24, 2007 by Jerry Neufeld
Sugarbeet powdery mildew has been identified in the Magic Valley near Filer, Idaho, today (7/23/07) by Amalgamated Sugar Company fieldmen Nic Wittman and Dave Scantlin. Dr John Gallian confirmed the diagnosis. Growers in the
area are advised to begin their powdery mildew spray programs to minimize economic loss.
Green peach aphids
Potato Magic Valley
Posted on: July 10, 2007 by Jeff Miller
A report was received today from a consultant that green peach aphids were seen in a couple of potato fields. Now would be a good time to intensify the scouting of fields. The best place to look is at the edge of fields on nightshade plants.
Spotted alfalfa aphid
Alfalfa Magic Valley
Posted on: July 10, 2007 by Dale Baker
Glenn Shewmaker has reported a sighting of spotted alfalfa aphid in the Mini-Cassia area. Growers need to scout carefully. This species can kill seedling stands and decrease yields in established fields.
Adult Colorado Potato Beetles
Potato Magic Valley
Posted on: June 7, 2007 by Jeff Miller
Adult Colorado potato beetles have been observed the past week. As Mike Thornton mentioned in an earlier alert, the adults do not cause too much damage. Look for eggs on the underside of potato leaves. When eggs begin to hatch a foliar insecticide application may be needed if a systemic insecticide was not used at planting.
Rhizoctonia canker
Potato Magic Valley
Posted on: June 6, 2007 by Jeff Miller
Rhizoctonia canker is developing on some potatoes. While there are no documented control measures that can be recommended at this stage of crop development, growers can look at underground stems to evaluate how severe Rhizoctonia stem canker may be for this season.
Rhizoctonia chemical control is obtained with seed-piece and and in-furrow treatments. It is not known if fungicide applications made at this time or later will have any effect on Rhizoctonia.
Alfalfa weevils and aphids
Alfalfa Magic Valley
Posted on: June 6, 2007 by Jeff Miller
Alfalfa weevils and aphids (species not identified) have been observed in alfalfa fields in the Rupert-Burley area.
Idaho Potato Pest Management Grower Meeting
All Crops Magic Valley
Posted on: February 5, 2007 by Nora Olsen
The annual Idaho Potato Pest Management Association (IPPMA) meeting is scheduled for February 13, 2007 at the Odd Fellow’s Hall, Wendell, Idaho. All are welcome. The meeting will start at 9:00 a.m. until 1:00 p.m. Lunch is provided. Three (3) Idaho Pesticide Recertification credits are available.
Topics will include:
• Cleaning equipment and storages for pest protection
• Potato Seed Treatments
• Impact of soil applied pesticides on potatoes
• New Potato Cyst Nematode in Idaho
• Nightshade control options
• Cruiser Maxx Seed Treatment
If you have any questions, contact Nora Olsen at 736-3621 or norao@uidaho.edu
Early blight forecast
Potato Magic Valley
Posted on: June 26, 2006 by Jeff Miller
The P-Day threshold has been reached in the Twin Falls and Rupert areas. Treatment for early blight is recommended at this time. This calculation is based on a crop emergence date of May 10-15.
Early blight forecast
Potato Magic Valley
Posted on: June 21, 2006 by Jeff Miller
A total of 300 P-days has accumulated in the Twin Falls area. This is the threshold for the optimal time for the first fungicide treatment for early blight control.
The late blight forecast for the Twin Falls and Rupert areas is moderately low. However, recent thundershower activity has made conditions more favorable for late blight development. Fungicides that are applied for early blight control will provide protection against late blight.
Stripe Rust in Wheat
Small Grains Magic Valley
Posted on: June 5, 2006 by Juliet Windes
Stripe rust has been reported now infecting the HRW Moreland in the Rupert / Paul area. Reports of low levels of stripe rust in Brundage SWW have indicated attenuated progression of the disease with higher temperatures. Continue to scout susceptible varieties, such as Deloris and Moreland, and scouting of susceptible spring wheat varieties should also be done at least twice a week.
Sugarbeet root maggot
Sugarbeets Magic Valley
Posted on: June 2, 2006 by Kelly Tindall
According to sticky stake captures, sugar beet root maggots have reached threshold in about 50% of trap locations in the Minidoka area. Counts in the Cassia area are still below threshold. Consult Amalgamated’s website for trap captures in your area to determine if insecticide is warranted in your area. (http://www.amalgamatedsugar.com/articles/2006RtMaggotStickyStake.pdf)
Cereal Leaf Beetle
Small Grains Magic Valley
Posted on: May 16, 2006 by Kelly Tindall
Cereal leaf beetle adults are emerging in the Magic Valley. Eggs in sufficient numbers to warrant treatment have been found in Twin Falls County. You should look for stripping of the leaves or adult activity when in the field. Adults are 1⁄4 to 3⁄8 inch, with a metallic blue head and wing covers. Behind the head (pronotum) is reddish and they have yellow-orange legs. Females lay yellowish to brownish colored, oval shaped eggs singly or in pairs and larvae begin to hatch 11 days after the eggs are laid. Larvae are yellow to yellow-brown with a dark mass of slimy fecal material on their backs. Both larvae and adults cause similar damage. Treat when there are three larvae or eggs per plant up to the boot stage. After boot, treat at one larva per flag leaf.
Cutworms in sugarbeets
Sugarbeets Magic Valley
Posted on: May 11, 2006 by Kelly Tindall
Cutworms ½ - ¾ inches were found in sugarbeets near Hunt in Jerome County. There are many species that attack sugarbeets but all are nocturnal, so you may see injury but not readily find the insect damaging the plants. If you see skips in the field, dig around the in the soil where you would have expected a plant and you will likely find the lower portion of a cut plant. Larvae are often found less than an inch below the soil surface near a damaged plant. At this time there are no established thresholds for cutworms in sugarbeets, but it may be worthwhile to consider adding an insecticide in with your next post-emergence herbicide application if you are seeing larvae and signs of injury. If you have any questions, you can contact Kelly Tindall (734-9590) or your Amalgamated Fieldman.
Withdrawal of the SLN registration for Eminent on Sugar Beet
All Crops Magic Valley
Posted on: July 19, 2005 by Jerry Neufeld
Dr. John Gallian, Sugarbeet Specialist and Plant Pathologist at the University of Idaho Twin Falls R&E Center posted this message to the UIsugarbeet-INFO digest regarding registration for Eminent Fungicide.
Today the US EPA has ordered the Idaho Department of Agriculture to withdraw the Special Local Needs registration 24(c) for Eminent fungicide for use on sugarbeets for powdery mildew and Cercospora leafspot control that was issued on June 3, 2005. We will not be able to use the material this year.
Eminent is in a different class of fungicides than either our currently registered strobilurins or the benzimidazole. We attempted the registration because it was an important tool for fungicide resistance management.
Onion Bulb Mite
All Crops Magic Valley
Posted on: April 21, 2005 by Jerry Neufeld
Charlie Robinson with Western Farm Service in Parma is reporting that onion bulb mites have been found in onion fields southwest of Caldwell. In one case there is an estimated 30% stand loss. The mites were positively identified by U of I Extension Pathologist Krishna Mohan. Dr. Mohan said that ”damping off” has been a problem in onions this spring. However, he warned if you are experiencing onion stand loss, it may not be “damping off” it may be bulb mites. Positive identification needs to be made by using a microscope to examine either undecayed vegetation from the field or the onions. Fields that have a history of bulb mite problems, or onion fields with undecayed vegetative matter are more prone to these pests. No treatment thresholds exist and there are no in-season treatments available. Preventative soil fumigation treatments can help to control this pest.
Cutworms
All Crops Magic Valley
Posted on: April 14, 2005 by Jerry Neufeld
Representatives from Amalgamated Sugar Company are reporting they have found a few sugarbeet fields around the valley that are being damaged by cutworms. Weedy spots and field borders are typically “hot spots” for these pests.
IPPMA potato grower educational meeting
Announcements Magic Valley
Posted on: February 3, 2005 by Nora Olsen
The University of Idaho and the Idaho Potato Pest Management Association will have an educational grower meeting on Feb. 23, 2005 from 9 am to 1 pm at the Odd Fellow's Hall in Wendell. Topics will include: storage issues, late blight and ring rot, aphid and colorado potato beetle management, growing potatoes will less water, insecticide seed treatment, and water outlook for the Magic Valley. Lunch will be provided and 2 recertification credits will be available. All are welcome. Contact Nora Olsen (208-736-3621) for additional information.
White mold
Potato Magic Valley
Posted on: July 19, 2004 by Jeff Miller
White mold is appearing in the Magic Valley. If you have a field with a history of white mold and have not treated, now is a good time to make a fungicide application for white mold control. All fungicides work most effectively when applied BEFORE the disease appears.
Early blight
Potato Magic Valley
Posted on: June 29, 2004 by Jeff Miller
The P-Day threshold for early blight has been reached in the Twin Falls area. As of this week, 300 P-days have accumulated using May 10 as an estimated general emergence date. The application threshold has not been reached yet in the eastern Magic Valley (Rupert-Burley).
green peach aphids
Potato Magic Valley
Posted on: June 25, 2004 by Jerry Neufeld
Nora Olsen, Extension Specialist with the U of I at the Twin Falls R and E Center is reporting that colonizing green peach aphids have been identified in the Magic Valley. Careully scout fields and apply appropriate insecticides as necessary.
Colorado Potato Beetle
Potato Magic Valley
Posted on: June 4, 2004 by Terry Helms
Colorado Potato Beetle adults have been abundant in fields South of Burley
for about a week. No egg activity as of yet.
cereal leaf beetle
All Crops Magic Valley
Posted on: April 7, 2004 by Jerry Neufeld
Brad Brown, UI Crop Management Specialist, is reporting that adult cereal leaf beetles are beginning to emerge and have begun flying around the western Treasure Valley of Idaho. Overwintering adults begin flying and mating when daytime temperatures reach 66 degrees F. Egg laying on host plants will take place within about 10 days of emergence. Preferred hosts are spring seeded small grains, especially oats and barley. Eggs take from 4 to 23 days to hatch depending on temperature. Scouting for eggs early will give you an idea of the damaging larval population you can expect in May.
Minimizing Root-Knot Nematode Problems On Potato In This Sea
All Crops Magic Valley
Posted on: September 24, 2003 by Dr. Saad Hafez
A severe winter is one of the characteristics for Idaho's weather. But, mild winter conditions during the current year followed by an early warm spring and a hot summer produced a perfect condition not only for the growth of potato but also for the 'unseen enemy' nematode. It has been a perfect condition for the nematode multiplication, resulting in severe damage on the 2003 potato crop.
Among all abiotic factors, temperature plays an important role on the nematode life cycle, feeding and multiplication rate. Deep frost and lower temperatures during the winter season reduce the nematode population and there by minimize the nematode damage on the succeeding potato crop. This year crop season is characterized by unusual mild winter with very early warm spring, which leads to the more nematode generations within a short period. This environment is highly congenial for the development of all nematodes. Although the nematode diagnostic lab can determine the initial nematode population before planting of potato, no method is available to determine the accurate population during the crop growth period. But, when there is a will there is a way. Yes, one of the ways by which growers can minimize the root-knot damage on potato is to harvest the crop early and not to keep the crop in storage. Adoption of such a practice will be highly useful to the growers whose field has a previous history of root-knot nematodes.
Pink rot
Potato Magic Valley
Posted on: August 20, 2003 by Jeff Miller
Severe pink rot has been identified in several fields in central and eastern Idaho. Plants appear wilted with leaves dying and plant lying down. This is different from the typical flagging symptoms associated with Verticillium wilt. Infected plants are showing lesions on the below ground stem that resemble severe Rhizoctonia. Infected stem tissue easily sloughs off. The pathogen grows from an initial below-ground stem infection up and down the stem. Tubers are becoming infected by the pathogen growing out the stolon or by direct contact if tubers are touching infected stems. Some fields have shown extremely high infection rates. In these cases, immediate vine kill is advised to prevent the pathogen from growing into healthy tubers. The severity of the problem is most likely caused by the extended high temperatures we have experienced the last several weeks. Maximum soil temperatures have been above 80 F for much of July and the early part of August. Extra water that may have been applied to help manage heat stress has compounded the pink rot problems. The University of Idaho would like to receive pink rot samples in order to determine fungicide sensitivity. Please contact Jeff Miller at 208-397-4181 or by email at jsmiller@uidaho.edu.
early blight
Potato Magic Valley
Posted on: July 7, 2003 by Terry Helms
Found Early Blight 7-4-03 in 1 Russet Burbank field near Burley.
Early blight in potatoes
Potato Magic Valley
Posted on: July 7, 2003 by Jeff Miller and Nora Olsen
Early blight has been found in the Magic Valley. The samples had large, black stem lesions similar to late blight. However, distinct early blight lesions were present on the foliage. Although this has been seen only on a limited scale, it stresses the importance to scout fields regularly and to bring in any suspect plant samples into the University of Idaho for confidential evaluation.
Green peach aphids found
Potato Magic Valley
Posted on: June 27, 2003 by Jeff Miller
Green peach aphids have been positively identified in both Cassia and Power counties in commercial potato fields. Intensive scouting should be performed and insecticide programs may need to be initiated, depending on cultivar, destination of crop, and previous (at planting or at hilling) insecticide use. Please contact University of Idaho Extension personnel with any specific questions.
Western Cherry Fruit Fly
Tree Fruits Magic Valley
Posted on: June 3, 2003 by Tim Davis
The Idaho State Department of Ag detected another adult WCFF in a trap near Sunnyslope June 2, 2003. According to the model this is a bit late for the first adult emergence but anyhow your applications should be applied if you have not already done so.
