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potato psyllid update
Potato All Locations
potato psyllids
Posted on: August 14, 2015 by Erik Wenninger
Abundance of potato psyllids captured in potato fields in Idaho is up slightly from last week. We captured 63 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Payette, Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Cassia counties. In addition, we found one potato psyllid nymph on a leaf sample from a field in Gooding County.
All of the psyllids collected last week (cards deployed during the week of July 26 and collected during the week of August 2) tested negative for liberibacter (Lso), the bacterium that causes zebra chip.
We captured 43 psyllids from our fortnightly bittersweet nightshade sampling around the Treasure and Magic Valleys. This also is up slightly from the previous samples.
We collected tubers this week and last from several fields that have had the highest incidence of liberibacter-positive psyllids. Foliar symptoms were mostly lacking and, although most tubers examined were clean, a few were found with apparent zebra chip (ZC) symptoms. These samples are being tested for liberibacter, which is the only way to determine with certainty whether or not the plants actually have ZC.
Although all psyllids collected last week were negative for liberibacter and tuber samples that we have examined have been mostly clean, the level of liberibacter found in psyllid samples from Canyon and Ada counties during recent weeks suggests that risk of ZC may be higher in this area. Therefore, we encourage growers and crop consultants to scout for symptomatic plants and to consider this risk level when making insecticide decisions through the remainder of the season.
Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
new layout for PNWPestAlert.net
Announcements All Locations
Posted on: August 14, 2015 by Jerry Neufeld
We are excited to announce a new look and added functionality for the PNWPestAlert.net website. We have been busy this summer, working with our programmer to change the look of the website, as well as adding some additional functions. In a few days we will change over to the new webiste and begin using it. We are also adding content area for “Landscapes and Gardens”. This area of the website will be administered by Ariel Agenbroad, Area Extension Educator for Food Systems & Small Farms with University of Idaho Extension. On the new homepage, you will now see three categories for Alerts: Current Alerts will show all Alerts posted to the website; Crop Alerts will show only Alerts related to agricultural crops; and Landscape and Garden Alerts will show only Alerts related to urban landscapes and garden environments. Current subscribers do not need to do anything different to continue to receive your chosen alerts. However, if you would like to make changes to your user profile or sign up to receive “Landscape and Garden” alerts, you can do that by clicking on “Edit User Profile” (lower left hand side on the new home page) and then make any desired changes to your profile.
We hope you enjoy the new look and functionality of the website and bear with us while we get the bugs out of the new system (no pun intended). If you encounter any issues with the new site, please contact us at jerryn@uidaho.edu or ariel@uidaho.edu and we will address your concerns as soon as possible.
Jerry Neufeld
Ariel Agenbroad
Late blight management meeting
Potato All Locations
Late blight
Posted on: August 14, 2015 by Jeff Miller
A meeting on managing late blight going into storage will be held at the Aberdeen High School on Tuesday, August 18 at 10:00 AM. Speakers will be Dr. Nora Olsen (University of Idaho) and Dr. Jeff Miller (Miller Research). Call Jeff at 208-431-4420 for more information.
Malheur Exp. Station Onion Variety Day
Onion Treasure Valley - Oregon
Posted on: August 14, 2015 by Bill Buhrig
Please join us for the annual Onion Variety Day at the Malheur Experiment Station outside of Ontario on August 25. Tour the plot in the morning and catch lunch as well! It will be a good time!
Check out the attached PDF for more information!
More late blight samples
Potato All Locations
Late blight
Posted on: August 14, 2015 by Jeff Miller
Late blight had been confirmed in additional counties. Positive samples were confirmed in Madison, Fremont, and Jefferson counties yesterday and this morning. Two samples have also been confirmed in Cassia County - one on the east side an another on the west.
Late blight in Cassia, Madison, Fremont, and Jefferson Count
Potato All Locations
Late blight
Posted on: August 13, 2015 by Jeff Miller
Late blight had been confirmed in additional counties. Positive samples were confirmed in Madison, Fremont, and Jefferson counties yesterday and this morning. Two samples have also been confirmed in Cassia County - one on the east side an another on the west.
Potato Diseases Update
Potato Eastern Idaho
late blight, early blight, white mold, bacterial stem rot
Posted on: August 8, 2015 by Phillip Wharton
In the Treasure Valley area Dr. Mike Thornton reports that they are primarily seeing white mold, bacterial stem rot and early blight. The crop is beginning to senescence in some fields, and growers should be carefully monitoring soil moisture to make sure they match water applications to crop use.
In the rest of southern and south eastern Idaho conditions remain favorable for late blight. With the current frequent rain showers and thunderstorms moving through the area and cooler night time temperatures growers should be very vigilant for late blight. In the past two weeks, Dr. Jeff Miller has reported that most of the late blight out breaks have been spread by the thunderstorms moving through the area. This is evident by the uniform levels of disease spread throughout infected fields instead of in isolated infection points or at the edge of fields spreading inwards.
In the past week, the University of Idaho has confirmed 4 more positive infections in Power county and two more in Bingham county but none in Minidoka county. To date, the late bight out breaks appear to be limited to these three counties. All isolates from these outbreaks have been identified as the US 23 genotype and mefenoxam (Ridomil) sensitive.
As we move towards harvest, growers affected by late blight need to be aggressive in managing the disease at the end of the season and going into storage. Growers should be aware that in addition to attacking foliage, late blight can infect tubers at any stage of development before and after harvest and in storage, with symptoms and rot usually only showing up in storage. Late blight infection of tubers is characterized by irregularly shaped, slightly depressed brown to purplish areas on the skin. These symptoms may be less obvious on russet and red-skinned cultivars. A tan to reddish-brown, dry, granular rot is found under the skin in the discolored area, extending into the tuber usually less than half an inch. For more information and photos of late blight tuber symptoms see the attached link (http://bit.ly/1KWFt6a).
Late in the season it is advisable to avoid excessive irrigation as tubers become infected with late blight when spores wash down through the soil from infected leaves. Vines should also be killed at least two weeks before harvest, especially in blight infected fields. This interval minimizes the chance of tubers getting contaminated with late blight inoculum during harvest, and allows previously infected tubers to decompose in the field. If blight is present in the field or in the vicinity of the field at harvest, it may also be beneficial to spray foliage after vine killing with labeled fungicides to kill living late blight spores on the foliage.
For more detailed information on a late season checklist for managing late blight and fungicide fungicide recommendations see the attached link (http://bit.ly/1Kb3ELg).
For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases
Late blight update
Potato All Locations
Late blight
Posted on: August 8, 2015 by Jeff Miller
Late blight is spreading in several locations in southern Idaho. Please see the attached "Late blight update" for a summary of the epidemic and an overview of control measure. We have also attached a review of fungicides available for late blight control along with a checklist for managing late blight going into storage.
Links to web pages from the University of Idaho and Miller Research with additional information are listed below.
» http://www.millerresearch.com/alerts/pest-alerts/item/49-late-blight-management-2015
» http://www.idahopotatodiseases.org/lateblight.html
Potato psyllid abundance similar to recent weeks; more Lso-p
Potato All Locations
potato psyllids
Posted on: August 7, 2015 by Erik Wenninger
Abundance of potato psyllids in potato fields in Idaho this week was similar to the past two weeks, if not slightly lower. We captured 37 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Payette, Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Cassia. In addition, we found a potato psyllid on a card from a field in Power County that was collected last week and submitted to our lab this week.
From week 10 of sampling (cards deployed the week of July 12th and collected the week of the 19th), we collected 14 psyllids that tested positive for liberibacter (Lso), the bacterium that causes zebra chip. All were from fields in Canyon or Ada counties.
From week 11 we had several psyllids, mostly in the Treasure Valley, that tested positive for liberibacter (Lso), the bacterium that causes zebra chip. Positive psyllids were found in Payette County, Canyon County (four different fields), Ada County (15 positive psyllids in one field), Owyhee County, and Twin Falls County. In addition, we found positive psyllids at our bittersweet nightshade site in Murtaugh and at Dierkes Lake in Twin Falls (one from each site).
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
corn earworm
Corn Treasure Valley
corn earworm
Posted on: August 6, 2015 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 6. Corn earworm moths lay eggs in corn with fresh silk. Since silking is done for the year, this will be my last corn earworm count for the growing season.
Melba Area 0
South of Nampa 0
Middleton Area 0
Parma Area 8
Wilder Area 44
Homedale Area 4
Pride Lane 0
Spider Mites
All Crops Treasure Valley
Spider MItes
Posted on: July 31, 2015 by Stuart Reitz
Two-spotted spider mites are being found in bean and mint fields in the Treasure Valley. With the return of very hot weather, spider mite populations may build up rapidly to damaging levels.
Scout bean, mint and other susceptible crops, such as sugar beets, corn, and potato, to determine if action is necessary. For more information on two-spotted spider mites, consult the PNW Insect Handbook at the link below and contact the extension office.
More positive psyllids in Ada County; first Payette and Powe
Potato All Locations
Potato Psyllid
Posted on: July 31, 2015 by Erik Wenninger
Abundance of potato psyllids in potato fields in Idaho this week slightly increased, with 57 psyllids captured (compared to 43 last week) across the Treasure Valley, Magic Valley, and Upper Snake. Psyllids were captured this week from several fields in Ada and Canyon counties, as well as from sites in Owyhee, Payette, Twin Falls, Jerome, Cassia and Power counties. This represents the first psyllid captured in Payette as well as in Power County.
Last week we were waiting for results from psyllids captured on cards deployed in potato fields July 6th to 13th. Five psyllids from two different fields in Ada County tested positive for liberibacter (Lso), the bacterium that causes zebra chip. We continue to run a little behind receiving results, but they will be posted on the website below as soon as they come in. Please continue checking throughout the week. We are still waiting on results from psyllids captured last week.
We captured 27 psyllids at our bittersweet nightshade sites around the Treasure and Magic Valleys.
We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
Grape Mealybugs
All Crops Treasure Valley
grape mealybugs
Posted on: July 30, 2015 by Jerry Neufeld
Large numbers of male grape mealybugs have been found in two of the pheromone lure traps in the winegrape research vineyard trial plots in Parma between 7/23 and 7/29 . Mealybugs damage grapes by contaminating clusters with cottony egg sacs, larvae, adults, and honeydew. To date, we have not seen any evidence of crawlers, egg sacs or females on any winegrape vines in the vineyard trial plots.
In the winegrape research trial plots we have made 3 pesticide applications for mealybug this season- a late dormant oil, an early season and a July 17 foliar application of Provado (thiacloprid) - so it is likely that we are trapping males from a source outside of the winegrape trial plots. Susceptibility to mealybug damage varies by variety. It is worse on varieties that produce clusters close to the base of the shoot because the fruit often touches old wood. There is also the potential for the grape mealybug to vector leaf roll virus in grapes. For more information on this pest, including photos and management strategies, visit http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug and http://www.ipm.ucdavis.edu/PMG/r302301811.html.
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug
Grape Mealybugs
All Crops Treasure Valley
grape mealybugs
Posted on: July 30, 2015 by Jerry Neufeld
Large numbers of male grape mealybugs have been found in two of the pheromone lure traps in the winegrape research vineyard trial plots in Parma between 7/23 and 7/29 . Mealybugs damage grapes by contaminating clusters with cottony egg sacs, larvae, adults, and honeydew. To date, we have not seen any evidence of crawlers, egg sacs or females on any winegrape vines in the vineyard trial plots.
In the winegrape research trial plots we have made 3 pesticide applications for mealybug this season- a late dormant oil, an early season and a July 17 foliar application of Provado (thiacloprid) - so it is likely that we are trapping males from a source outside of the winegrape trial plots. Susceptibility to mealybug damage varies by variety. It is worse on varieties that produce clusters close to the base of the shoot because the fruit often touches old wood. There is also the potential for the grape mealybug to vector leaf roll virus in grapes. For more information on this pest, including photos and management strategies, visit http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug and http://www.ipm.ucdavis.edu/PMG/r302301811.html.
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 30, 2015 by Jerry Neufeld
It appears corn earworm moths (adults) are starting to show up in slightly larger numbers, although, my trapping numbers are still fairly low. Below are the moth counts from this morning, July 30.
Melba Area 0
South of Nampa 0
Middleton Area 3
Parma Area 4
Wilder Area 18
Homedale Area 12
Pride Lane 0
I am not aware of Idaho treatment thresholds for this pest, however, the following excerpt was taken from an Extension Publication from Purdue University.
Management Guidelines
Corn Insect Control Recommendations: E-series 219-W (PDF)
For seed production fields, if 10 or more moths are captured in a pheromone trap for several consecutive nights, economic damage is possible. However, only fields silking and/or pollinating during this time are candidates for treatment.
You may want to step up your field scouting and work closely with your crop consultant to determine if a treatment is necessary.
» http://insect.pnwhandbooks.org/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/corn-sweet-corn-earworm
Pomology Program Annual Fruit Field Day
All Crops Treasure Valley
Posted on: July 29, 2015 by Jerry Neufeld
The University of Idaho Annual Fruit Field Day will be held on Friday August 28, 2015; 8:30 am to 1:00 pm at the U of I Parma Research and Extension Center Pomology Orchard and Vineyard site, about 4 miles north of Parma, Idaho. The registration will start at 8:30 am and program will start at 9:00 am (sharp). Click on the pdf below for more details.
Late blight
Potato All Locations
Posted on: July 28, 2015 by Jeff Miller
The late blight in Minidoka County has been determined to be the US-23 strain. This strain is sensitive to mefenoxam. As a result, growers can use Ridomil Gold pre-packs (e.g. Ridomil Gold Bravo, Ridomil Gold MZ) to manage late blight. Fields which have been treated with mefenoxam appear to be free of late blight even though they are close to fields with confirmed late blight.
Additional fields in Minidoka County have been confirmed, with the latest finds close to Rupert.
More information on fungicides for managing late blight can be found at the link below.
Zero positive potato psyllids from last week
Potato All Locations
Potato Psyllid
Posted on: July 24, 2015 by Amy Carroll
Overall abundance of potato psyllids in potato fields in Idaho this week continued to decline, with 43 psyllids captured (compared to 71 last week) across the Treasure and Magic Valleys. Psyllids were captured this week from several fields in Ada and Canyon counties, as well as from a few different sites in Elmore and Twin Falls counties. We are still waiting on a shipment of sticky cards from our “Light” sites (approximately 20 fields) in Cassia and Minidoka counties.
Zero psyllids from last week tested positive for liberibacter (Lso), the bacterium that causes zebra chip—one each from Canyon, Ada, and Minidoka counties.
We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 23, 2015 by Jerry Neufeld
I checked the corn earworm traps today. I found a few, but not too many. Below are the counts.
Location 7/16 7/23
Melba Area 0 0
South of Nampa 0 0
Middleton Area 0 0
Parma Area 0 0
Wilder Area 0 16
Homedale area 0 2
Pride Lane 0 0
More late blight in Minidoka County
Potato All Locations
Late blight
Posted on: July 22, 2015 by Jeff Miller
Late blight had been confirmed in two additional fields in Minidoka County. It is likely in several others. Pathogen spread is likely with current weather conditions. Growers are encouraged to report additional finds so that the extent of infection and rate of spread can be documented.
Potato Pest Management Field Day
Potato All Locations
Posted on: July 21, 2015 by Jeff Miller
Miller Research will be holding a pest management field day on Thursday, August 13 at the Miller Research facility located near Acequia, ID (426 E 200 N). A short presentation will be given in the office followed by a tour of the research plots.
The presentations will focus on and chemical management of diseases and will highlight research which has been funded by the Pacific Northwest Potato Research Consortium. We have requested 3 ISDA pesticide recertification credits and 3 CCA (Pest Management) credits for this meeting.
Lunch will be provided. Please RSVP to Jeff Miller by August 10 at 208-531-5124 or by email at: jeff@millerresearch.com so that we can get an accurate count for room preparation purposes.
See the attachment for additional details.
Late blight in Minidoka County
Potato All Locations
Late blight
Posted on: July 21, 2015 by Jeff Miller
Late blight has been positively identified in Minidoka County. It appears the infections resulted from a spore shower and it is likely that other fields are also affected. It is critical for growers to scout fields. Affected fields should be sprayed on a 7-day schedule. If thundershowers persist, a 7-day schedule is advised for all in the area. Management guidelines are available at the link below.
» http://www.millerresearch.com/alerts/pest-alerts/item/49-late-blight-management-2015
Weekly Potato Disease Update
Potato Eastern Idaho
Late blight
Posted on: July 17, 2015 by Phillip Wharton
Potato diseases are starting to pick up across the state with the recent wet weather. Dr. Mike Thornton reports that in the Treasure Valley area, there were locally heavy rains associated with thunderstorms much of the past week with some hail damage in a few isolated areas. Cooler temperatures, when combined with the rain are favorable for diseases such as late blight, white mold and aerial stem rot (with hail damage). As such field men should be vigilant and fields should be scouted on a regular basis and growers are urged to apply protectant fungicides.
In the Magic valley early blight and white mold is on the increase due to recent rain showers. Again, due to the weather growers should be vigilant for signs of late blight.
In south eastern Idaho there are currently three confirmed fields in Bingham Co. with late blight. Genotyping of isolates have identified the strain as US 23. It is imperative that field men and growers bring in any suspected late blight samples to the university offices at Idaho Falls or Aberdeen for confirmation and so that we can monitor the late blight strains causing the epidemic. A knowledge of the strains involved in the outbreak will allow us to make better fungicide recommendations to growers. All sample origin information will be kept confidential with only the county of origin being reported.
Since the strains from the current outbreak in Bingham county are US 23, we are dealing with a mefenoxam sensitive strain of late blight. The most effect product for the control of mefenoxam sensitive late blight strains is Ridomil Gold Bravo. Ridomil has been shown to have curative properties and may halt a late blight epidemic if it is applied early enough in the outbreak (less than 1% field infection). Do not use Ridomil if you don't know what strain you have in your crop, as most other strains of late blight are resistant to Ridomil.
In fields where only a few random late blight lesions have been found evenly distributed throughout field (0 - 1% foliar infection), an application of Ridomil Gold Bravo should be made followed by a systemic fungicide such as Revus, Forum, Curzate 60DF, Ranman, Tanos, Gavel or Previcur Flex 5 - 7 days after the first application. The field should then be monitored closely until the end of the season and protectant fungicide applications (EBDC or Chlorothalonil products) made every 7 days until harvest. A late season application of Gavel has been shown to provide additional protection from tuber blight.
In infected fields with one or more (up to 5) loci spreading from the edge of the field or from several centers within the field (1% overall field infection but locally heavily infected plants 5 - 10%), infected areas should be destroyed with Reglone or a similar vine killing herbicide. Destruction of infected areas within the crop with late blight should follow the rules that 30 rows either side of the newest lesions at the border of the late blight locus and 100 feet along the row (either side) are killed with Reglone or with Gramoxone. Although harsh, research has shown that the latent period between infection and symptom development is about seven days and although not visible plants within this area are already infected. An application of Ridomil Gold Bravo should then be applied as above and followed by an alternative fungicide 5 days later. Protectant fungicide applications should then be made every 7 days until harvest.
For more detailed information on late blight fungicide recommendations see the attached link (http://bit.ly/1LfZtmW)
For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases
Potato psyllid numbers dip; more positive psyllids from last
Potato All Locations
potato psyllids
Posted on: July 17, 2015 by Erik Wenninger
Overall abundance of potato psyllids in potato fields in Idaho this week generally were considerably lower than the previous week, which may have been due to the cooler temperatures. Psyllids were captured this week in Canyon, Owyhee, and Elmore counties, as well as from several different sites in both Jerome and Twin Falls counties. We are still waiting on a shipment of sticky cards from our “Intense” sites in Canyon and Ada counties.
Three psyllids from last week tested positive for liberibacter (Lso), the bacterium that causes zebra chip—one each from Canyon, Ada, and Minidoka counties.
Psyllid captures also were lower at our bittersweet nightshade sites around the Treasure and Magic valleys.
We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.
Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
Corn Earworm
All Crops Treasure Valley
corn earworm
Posted on: July 17, 2015 by Jerry Neufeld
I checked the corn earworm traps yesterday and did not find any corn earworm adults. Below are the general locations of the traps.
Melba Area
South of Nampa
Middleton Area
Parma Area
Wilder Area
Homedale Area
Pride Lane
