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Spider Mites

     Treasure Valley - All
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.

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More positive psyllids in Ada County; first Payette and Powe

Potato     
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

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grape mealybugs

     Treasure Valley - All
Canyon county, Idaho
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.

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corn earworm

Corn     Treasure Valley - All
Canyon county, Idaho
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.


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Pomology Program Annual Fruit Field Day

     Treasure Valley - All
Canyon county, Idaho
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.

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Late blight

Potato     
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.

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Zero positive potato psyllids from last week

Potato     
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

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corn earworm

Corn     Treasure Valley - All
Canyon county, Idaho
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

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More late blight in Minidoka County

Potato     
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.

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Potato Pest Management Field Day

Potato     
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.

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Late blight in Minidoka County

Potato     
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.

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What is the Pacific Northwest Pest Alert Network?

This website utilizes a network of growers around the Pacific Northwest. As information about pest infestations becomes available, registered users will receive updates pertaining to the specific crops that they may be growing at the time.