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Late Blight Information
Potato All Locations
Late Blight
Posted on: June 14, 2010 by Jerry Neufeld
A new feature at the USPESRT.ORG website (http://uspest.org/wea) features late blight risk maps that are updated frequently. For example, if you go to http://uspest.org/risk/tom_pot_map?state=ID you will see the Tomato-Potato Late Blight Risk map for Idaho. If you click on a pin, it brings up the full model for that weather station. For example, if you click on http://uspest.org/risk/models?sta=PMAI&mdl=tplb
it will bring up a page with specific information for Parma, ID. The late blight graph (top left of page) shows the change in infection risk due to temperature and moisture over the default period (past 14 days + forecasted 7 days).
If sufficient inoculum is nearby, infection is very likely if the risk index exceeds 4. This is the Smith version of the tomato-potato late blight risk model and is documented at http://uspest.org/npdn/riskdoc.html#TPLB.
Below is an explanation of the risk index:
1 = conditions are favorable for fungal spore formation if there are lesions on plants in the area,
3 = Conditions are favorable for infection if there is inoculum (spores) in the area.
4= The latent period following infection is completed, you will see the lesions of the new infections in the field.
These models reflect only weather induced sporulation and infection conditions, not whether inoculum is actually present in the area. Scout regularly to determine if there is inoculum in the area. As with all weather driven pest models, use with caution and be sure to verify the validity of weather data inputs for all sites. Plants are the most vulnerable to late blight after canopy
closure. Site specific irrigation events are not reflected in this weather data and may result in different risk levels.
Carla Thomas, Plant Pathologist with UC Davis provided this information.
Stripe rust possible
Small Grains All Locations
Stripe rust
Posted on: June 11, 2010 by Juliet Windes
While a small amount of stripe rust in wheat was confirmed by Brad Brown in southwest Idaho, it has not been confirmed in southeast Idaho and Magic Valley YET. However, flecking symptoms similar to early infection were seen in Aberdeen in Moreland hard red winter wheat. Due to extremely conducive weather conditions and widespread infection in Washington state, it is highly recommended that consultants and growers scout for stripe rust in all wheat. The wet and cool weather has prevented the resistance in varieties with High Temperature Adult Plant resistance from being activated, so varieties such as Alturas may be showing susceptible reactions. Consider spraying (especially susceptible varieties) in advance of infection. Please report stripe rust infections to Juliet Windes (208-529-8376) and / or Brad Brown (208-722-6701 ext 216). Additional information and pictures can be found at http://www.ag.uidaho.edu/scseidaho
Colorado Potato Beetle
All Crops Treasure Valley - Idaho
Colorado Potato Beetle
Posted on: June 10, 2010 by Jerry Neufeld
Dr. Mike Thornton, from the UI Parma Research and Extension Center, is reporting that overwintering Colorado Potato Beetle adults are beginning to emerge in southwest Idaho. This overwintering adult stage does not do any 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. This is the time for growers to be scouting for CPB, especially if they are using "soft" foliar insecticides that target control of early instar larvae.
» http://uspest.org/pnw/insects
» CPB Eggs
Colorado Potato Beetle
All Crops Treasure Valley - Idaho
Colorado Potato Beetle
Posted on: June 10, 2010 by Jerry Neufeld
Dr. Mike Thornton, from the UI Parma Research and Extension Center, is reporting that overwintering Colorado Potato Beetle adults are beginning to emerge in southwest Idaho. This overwintering adult stage does not do any 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. This is the time for growers to be scouting for CPB, especially if they are using "soft" foliar insecticides that target control of early instar larvae.
» http://uspest.org/pnw/insects
» CPB Eggs
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
Late Blight Forecast
Potato All Locations
Late Blight
Posted on: June 9, 2010 by Jeff Miller
A forecast for predicting the occurrence of late blight was developed at the University of Idaho in 2004 by Donna Henderson and Jeff Miller. Many different weather variables were analyzed for data collected from 1995 to 2004 in an attempt to relate outbreaks of late blight with weather. The most efficient prediction of late blight was related to the number of late blight favorable periods and the amount of rain in April and May. A favorable period was any hour the air temperature was between 50 and 80 F and the relative humidity was above 80%. While the model was not perfect, it was accurate about 80% of the time in predicting the occurrence of late blight.
Forecasts in 2010 were generated using data from Parma, Twin Falls, Rupert, Aberdeen, Fort Hall, and Rexburg. Based on the forecast, late blight is expected in Twin Falls, Rupert, Aberdeen, and Fort Hall. Any actual outbreak of late blight will be influenced by fungicide spray programs, presence of potential inoculum sources, and weather later in the season.
Our current recommendation is to plan on spraying at row closure and then continue on a 10-14 day schedule. This recommendation may be modified depending on subsequent weather patterns.
A useful discussion of fungicides effective against late blight can be found at following link: http://www.millerresearch.com/reports/Overview_of_Fungicides_for_Late_Blight.pdf
The evidence indicates that the late blight outbreak in southern Idaho in 2009 came from diseased tomatoes. We also have evidence that this may have happened in western Idaho in 2005. In 2009, a severe outbreak of late blight in the Northeast U.S. was linked to transplanted diseased tomatoes. If you are buying tomato transplants from a garden center in your area, keep an eye out for sick-looking plants. If you find any suspicious lesions, please contact us or an extension specialist from the University of Idaho for confirmation of late blight. Dr. Phillip Wharton of the University of Idaho has authored a publication on the impact of tomatoes with respect to potato late blight and it is included on a previous post. For more information on late blight in Idaho you can call the University of Idaho late blight hotline (1-800-791-7195). Or for instant updates on the status of late blight and other diseases in the state you can sign up for SMS text message notifications by texting “follow potatodiseases” to 40404.
Late blight was only confirmed in one area in southern Idaho last year. There are no cull piles or any apparent overwintering sources for the pathogen in the 2009 affected area. Potato seed can also be a source.
» http://www.millerresearch.com/reports/Overview_of_Fungicides_for_Late_Blight.pdf
Late Blight Information
Announcements All Locations
Late Blight
Posted on: June 9, 2010 by Jerry Neufeld
Click on the pdf below for additional information from UI Plant Pathologist Dr. Phillip Wharton about Early and Late Blight in potatoes.
Late Blight Leaflet
Announcements All Locations
Late Blight
Posted on: June 9, 2010 by Jerry Neufeld
Tomato and Potato Late Blight Alert Leaflet
In 2009, many gardeners and commercial farmers in the Northeast saw their entire crop of lovingly cared for tomatoes overcome with late blight and rot on the vine, while the plants withered up and died. Late blight is devastating on both tomato and potato plants and once the disease has taken hold of the plant there is very little that can be done to halt its progress. Last year the disease is thought to have started in tomato transplants and then spread from diseased tomato plants to healthy tomato and potato plants in surrounding gardens and commercial fields. Late blight can infect and kill plants within 10 days and the spores of pathogen can be carried in the air. The disease outbreaks that occurred in the Northeast last year were mainly due to a new strain of the late blight pathogen called US22. There was also an outbreak of late blight reported on potatoes in southeastern Idaho last summer. Fortunately, it was limited to only a couple of fields. However, what is worrying is that it was identified as being caused by the new US22 strain of late blight, suggesting that it also came from infected tomato plants. There were no confirmed reports last year in Idaho of late blight on tomatoes, but the presence of the US22 isolate suggest that late blight was probably more widespread in southeastern Idaho than reported. Idaho potato growers were extremely lucky last year. In the Northeast, the US22 isolate spread quickly from tomatoes to potatoes and caused widespread losses in commercial potato crops. This year there have already been reports of late blight found on tomatoes bought in a Walmart store in Kentucky, and those plants were identified as being produced in Michigan. With all the unseasonably wet weather we have been having in Idaho in the past few weeks it is important that people remain vigilant for signs of late blight in tomatoes and potatoes. The attached leaflet (click on the pdf below) is designed to help homeowners and growers identify diseased plants and informs them of what steps they can take if they think they have late blight on their plants.
For more information on late blight in Idaho you can call the University of Idaho late blight hotline (1-800-791-7195). Or for instant updates on the status of late blight and other diseases in Idaho you can follow us on Twitter at “http://twitter.com/potatodiseases” or sign up for SMS text message notifications by texting “follow potatodiseases” to 40404.
Table Grape Demonstration in Parma
Small Fruits Treasure Valley - Idaho
Cluster thinning
Posted on: June 8, 2010 by Tony McCammon
Dr. Essie Fallahi, Professor & Director of Pomology - University of Idaho has scheduled an on site / hands on training class.
Learn How to properly complete shoot thinning and how to manage Frost Damaged Vines on
June 14th 11:00 AM at the University of Idaho Table Grape Research site in Parma Idaho.
Please join Dr. Fallahi and fellow table grape growers for this informative training session.
Hands on training - Shoot Thinning and How to Manage Frost Damaged Vines
When: June 14th 2010 – 11:00 AM
Where: Parma Table Grape Research, 29603 U of I Lane, Parma, Idaho 83660
Cost: FREE
Call 208-573-8405 for Questions or email
Tree Fruit Pest Advisory
Tree Fruits Treasure Valley - Idaho
Codling Moth, Western Cherry Fruitfly
Posted on: June 7, 2010 by Tony McCammon
The attached Pest Advisory covers the following topics:
-Pests Area Updates - Codling moth, Fireblight,
Western Cherry Fruitfly, Flatheaded Borers.
-Rainfast Pesticides for our wet spring weather
-Chemical recommendations for Western Cherry Fruitfly
-Critical Timing for Codling Moth coverage
Cereal Leaf Beetle
Small Grains Treasure Valley - Oregon
Cereal Leaf Beetle
Posted on: June 4, 2010 by Jerry Neufeld
Dr. Clint Shock, Superintendant at the OSU Malheur Experiment Station is reporting an outbreak of Cereal Leaf Beetle in spring grains in Malheur County.
New pest Outbreaks
Tree Fruits Treasure Valley - Idaho
Drosophila Fly
Posted on: May 25, 2010 by Tony McCammon
The Spotted wing Drosophila has been trapped in Umatilla county Oregon. We do not want this fruit tree pest in Idaho. If you are willing to monitor for this pest in your orchards please contact Ben Simko with the ISDA.
Tree Fruit Advisory
Tree Fruits Treasure Valley - Idaho
Posted on: May 25, 2010 by Tony McCammon
Codling moth
Fire Blight
Leafhoppers
Thinning
New Pests ISDA
Organics
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.
sugarbeet root maggot
Sugarbeets Treasure Valley - Idaho
sugarbeet root maggot
Posted on: May 18, 2010 by Jerry Neufeld
According to a representative from Amalgamated Sugar Company, growing degree day models indicate that adult sugarbeet root maggot flies will begin their spring emergence and begin flying in the very near future. Adult flies will lay eggs near sugarbeet plants. After the larvae hatch they will begin feeding on the young sugarbeets. AMSCO representatives have not seen any adult flies yet, but warn they will be flying any day now. Look for these pests to appear in the western end of the Treasure Valley first. If you haven’t applied a treatment for sugarbeet root maggot, now is the time to do so. Consult your crop advisor or field representative from AMSCO for treatment options.
lygus in alfalfa seed
Alfalfa Seed Treasure Valley - Idaho
lygus bug
Posted on: May 18, 2010 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated about 227 degree days since January 1, 2010. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur on about May 27 in the Caldwell area.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Rimon, Assail, or Beleaf, as stand-alone sprays should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Select “ lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the “Select degree day model….” drop down box at the top of the form
2) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “parma id agrimet” in the “Washington, Idaho” box if you want information for a field near Parma). Make sure to select “None” at the top of the lists in the other two location boxes.
3) Leave the “Or upload your own…” box blank
4) In the “Forecast:” area, enter the 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 1st and 2nd instar 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.
5) 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.
6) 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.
Thanks to Dr. Jim Barbour for providing this information.
frost injury in winter barley
Small Grains Treasure Valley - Idaho
frost
Posted on: May 18, 2010 by Jerry Neufeld
Cereals Specialist Dr. Brad Brown from the UI Parma Research and Extension Center is reporting that yesterday some winter barley was brought in with all the symptoms of frost injury. Awns were twisted and the flag leaf was bound and twisted and was hindering head emergence. Some heads at the top had spikelets burned which were entirely white with no green color, and some spikelets below them were green but no discernible developing seed which may have aborted from the frost injury. The symptoms are similar to and commonly mistaken for 2,4-D injury, but differ in that frost injury shows parts of the head that are sterile. The publication “Spring Freeze Injury to Idaho Cereals”, Idaho Cooperative Extension Bulletin 724 describes the injury from frost in more detail. Click on the pdf below to read this publication.
Fruit Tree Advisory Newsletter
Tree Fruits Treasure Valley - Idaho
Fruit Tree Pests Update
Posted on: May 13, 2010 by Tony McCammon
Warm temperatures have increased insect activity in fruit trees. The attached file includes:
Codling moth Biofix ~ May 8th
Fire Blight update
Apple aphid
Sustainable control methods for Codling moth
2010 chemicals registered for Codling moth
Cereal Leaf Beetle
Small Grains Treasure Valley - Idaho
Cereal Leaf Beetle
Posted on: May 12, 2010 by Jerry Neufeld
Dr. Brad Brown from the UI Parma Research and Extension Center is reporting cereal leaf beetle larvae are being found in winter wheat and CLB eggs can be found in spring wheat. Now is a good time to scout for CLB eggs as an indication of potential larvae populations. Spring planted grains are preferred by CLB over winter planted grains.
Click on the pdf images below to see the CLB control recommendations from the 2010 PNW Insect Management Handbook and to see images of the CLB life stages. Also, click on the link below to read CIS 994 titled “Cereal Leaf Beetle” from the University of Idaho.
thrips control meeting
Announcements Treasure Valley - Idaho
thrips
Posted on: May 12, 2010 by Jerry Neufeld
Lynn Jensen, Onion and Potato Specialist with the OSU Malheur County Extension Office is planning a thrips control meeting on Monday May 17, 11:30am at the Malheur County Extension Office. One topic of discussion will be the newly granted Section 18 label on Movento. Pizza will be served. If you have any questions contact Lynn at 541.881.1417.
lygus in alfalfa seed
Alfalfa Seed Treasure Valley - Idaho
lygus bug
Posted on: May 5, 2010 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated 178 degree days since January 1, 2010. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually, but not always, occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur on about May 19.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Rimon, Assail, or Beleaf, as stand-alone sprays should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Select “ lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the “Select degree day model….” drop down box at the top of the form
2) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “parma id agrimet” in the “Washington, Idaho” box if you want information for a field near Parma). Make sure to select “None” at the top of the lists in the other two location boxes.
3) Leave the “Or upload your own…” box blank
4) In the “Forecast:” area, enter the 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 1st and 2nd instar 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.
Thanks to Dr. Jim Barbour for providing this information.
spider mites in mint
Mint Treasure Valley - Idaho
two spotted spider mites
Posted on: May 5, 2010 by Jerry Neufeld
Landview Fertilizer fieldmen are reporting that 2 spotted spider mites and aphids have already been found in established mint fields south on Nampa. The mites were found during routine field scouting operations. Like last year, it seems a bit early, but you may want to be on the lookout for these pests.
Cereal Leaf Beetle
Small Grains Treasure Valley - Idaho
Cereal Leaf Beetle
Posted on: April 26, 2010 by Jerry Neufeld
Dr. Brad Brown from the UI Parma Research and Extension Center is reporting cereal leaf beetle adults have been seen flying and egg laying is beginning. It is not too early to start scouting for CLB eggs as an indication of potential larvae populations. Spring planted grains are preferred by CLB over winter planted grains. Click on the pdf images below to see the CLB control recommendations from the 2010 PNW Insect Management Handbook and to see images of the CLB life stages. Also, click on the link below to read CIS 994 titled “Cereal Leaf Beetle” from the University of Idaho.
ISDA Pesticide Disposal Program
Announcements Treasure Valley - Idaho
Posted on: April 19, 2010 by Jerry Neufeld
Click on the pdf below for information about the Idaho State Department of Agriculture’s pesticide disposal program for this spring.
