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Onion Thrips update 6/28/2019

Onion    Treasure Valley

Onion thrips

Posted on: June 30, 2019 by Stuart Reitz

Below are the results from this past week’s thrips monitoring program. Thrips pressure continues to be strong – as there were increases in adults and immatures in most areas. Please keep in mind that numbers vary from field to field.
This week, we found Iris yellow spot virus in fields in Ontario, Nyssa and Fruitland, with the highest levels around 10% in a couple of fields. Infected plants have been more abundant closer to the edges of fields, which suggests that most transmission at this time is from adults dispersing into fields. That would change later in the season if immature thrips survive on infected plants and then transmit virus to other plants within a field.
As the onions’ canopy develops and leaves start folding over one another, be sure to use sufficient spray volumes and pressure to get insecticides down in the neck of plants. This week some I saw some recently sprayed fields that had dead thrips several inches up on the leaves but still had live ones in the neck at the base of leaves.
The Malheur Experiment Station Annual Farm Fest will be July 10, beginning at 8 AM with drone demonstrations followed by research tours and kids’ activities. ODA Director Alexis Taylor will be our special guest speaker at lunch. She will be there with other ODA representatives, including Susanna Pearlstein, ODA’s Produce Safety Program Manager, and Casey Prentiss. Please call 541-889-2174 to RSVP.



Figure 1. IYSV on leaves 2019-06-28

 
Adults per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22 6/29
Oregon Slope/Weiser 0.03 0.04 0.06 0.15 2.47 4.41 5.22
Vale 0.15 0.55 1.64 2.60 4.79 6.44 5.72
Ontario 0.07 0.03 0.78 0.71 1.92 4.35 5.98
Nyssa 0.02 0.07 1.32 1.03 3.67 5.20 7.33
Adrian 0.02 0.22 1.60 1.67 2.15 2.63 7.60
Fruitland 0.05 0.03 0.19 0.94 1.29 6.12 6.30
Parma - 0.09 1.60 0.67 2.75 7.89 3.47
Overall Average 0.06 0.15 1.03 1.11 2.72 5.29 5.95

Immatures per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22 6/29
Oregon Slope/Weiser 0.00 0.00 0.00 0.26 5.45 12.55 9.90
Vale 0.00 0.41 6.28 4.20 11.16 5.99 11.64
Ontario 0.00 0.00 3.60 1.71 8.71 22.81 21.28
Nyssa 0.00 0.02 3.56 5.52 8.00 10.58 26.98
Adrian 0.00 0.00 8.42 3.64 5.45 1.10 5.17
Fruitland 0.00 0.00 0.16 2.20 3.39 7.62 1.55
Parma - 0.00 1.97 4.37 1.66 2.90 12.78
Overall Average 0.00 0.06 3.43 3.13 6.26 9.08 12.76

Total average per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22 6/29
Oregon Slope/Weiser 0.03 0.04 0.06 0.42 7.92 16.96 15.12
Vale 0.15 0.96 7.92 6.79 15.96 12.43 17.36
Ontario 0.07 0.03 4.38 2.42 10.63 27.16 27.26
Nyssa 0.02 0.09 4.88 6.55 11.67 15.78 34.31
Adrian 0.02 0.22 10.01 5.31 7.61 3.73 12.77
Fruitland 0.05 0.03 0.35 3.14 4.68 13.74 7.85
Parma - 0.09 3.58 5.03 4.41 10.79 16.25
Overall Average 0.06 0.21 4.45 4.24 8.98 14.37 18.70


% Plants with Thrips
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22 6/29
Oregon Slope/Weiser 0% 4% 6% 14% 68% 81% 93%
Vale 0% 31% 64% 54% 81% 83% 76%
Ontario 0% 3% 34% 35% 73% 89% 96%
Nyssa 0% 5% 73% 56% 70% 87% 97%
Adrian 0% 19% 57% 53% 70% 86% 98%
Fruitland 0% 3% 17% 50% 54% 94% 100%
Parma 0% 7% 54% 41% 89% 84% 74%
Overall Average 0% 10% 43% 43% 72% 86% 91%


IYSV Incidence (% plants with lesions)
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22 6/29
Oregon Slope/Weiser 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Vale 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Ontario 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.9%
Nyssa 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.1%
Adrian 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Fruitland 0.0% 0.0% 0.0% 0.0% 0.0% 0.2% 9.4%
Parma 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Overall Average 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.5%

» Thrips update 6/28/2019

2019 Potato psyllid monitoring program in Idaho

Potato    All Locations

potato psyllid

Posted on: June 28, 2019 by Erik Wenninger

The University of Idaho, in collaboration with crop consultants across the state, will continue our monitoring program for potato psyllids, zebra chip disease, and liberibacter (Lso), the bacterium associated with zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by the Idaho Potato Commission, USDA, and generous in-kind contributions by our collaborators.

Following recommendations from our ZC Advisory Committee last year, we are shortening the duration of the program. We still plan to monitor about 100 fields across the state, but only with 4 sticky traps per field rather than the more intense sampling that was conducted on some fields in the past.

The first official deployment of sticky traps for the program will occur next week. However, following earlier than usual observation of potato psyllids in Oregon, we began deploying traps on a limited basis over the last three weeks. During the week of June 10, we captured 22 potato psyllids across six fields in Canyon County and one psyllid in a field in Payette County. During the week of June 17, we captured one psyllid in each of two fields in Canyon County and three psyllids across two fields in Payette County. We have yet to observe potato psyllids in Twin Falls County after three weeks of monitoring in a few fields. Over the last two weeks, we found psyllids in 8 of 12 fields (67%) and 4 of 23 fields (17%) being monitored, respectively.

It should be noted that observation of potato psyllids in Idaho during June is not at all unexpected. We typically would find our first psyllids during mid-May.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/cals/potatoes/news/psyllid-management

» http://www.uidaho.edu/cals/potatoes/news/psyllid-management

Marketing Class available for East Idaho Growers

All Crops    Eastern Idaho

Posted on: June 28, 2019 by Juliet Marshall

The University of Idaho Extension and Lee Andersen from Ririe Grain is offering a workshop for anyone wanting to learn the basics of the futures market and utilizing it in your grain marketing. Topics will include:

 Basics of the Futures Market
 Hedging Strategies
 Using Options
 Charting Techniques
 Order Types


Location & Time:


Rigby Courthouse Annex Building Upstairs Meeting Room
210 Courthouse Way – July 2nd
Classes are from 1:00 to 4:00 p.m.


Cost: Free

For Questions Call: or Email Madison County Extension Office (208) 716-5602, Jon Hogge jhogge@uidaho.edu

» Marketing_Class101_2.pdf

UI Ag Talk Tuesday July 2 at 8:00 AM at the Idaho AgCredit Rexburg branch

All Crops    All Locations

Posted on: June 27, 2019 by Kasia Duellman

Reminder: The next UI Ag Talk Tuesday will be hosted in Rexburg July 2 at the Idaho AgCredit Rexburg branch, 1586 N. 2nd E., at 8:00 AM.

Join UI Researchers, Extension Personnel, and ag professionals to learn about timely topics in ag production. For this next session on July 2, Jon Hogge will update us on the latest thrips investigations and cereal diseases. Other topics may include potato diseases, weed issues, and other crop challenges currently being faced.

These events are offered on the first and third Tuesdays at 8AM throughout the growing season at different locations in eastern Idaho. Breakfast beverages (coffee, juice) and light breakfast fare (e.g., pastries/donuts/fruits) will be provided. Venue and location differs, so look for the announcements via Treasure Valley Pest Alerts and on the UI Extension Calendar.

» https://webpages.uidaho.edu/extension-seed-potato/ATT.html

UI Dryland Cereals Field Day - THURSDAY June 27th

Small Grains    All Locations

Cereal Field Days - Update on varieties, diseases (stripe rust, foot rots, frost damage, etc)

Posted on: June 25, 2019 by Juliet Marshall

Join us for our first field day of the season! (South Eastern Idaho Extension and Wheat Breeding Trials). Catch up on the latest varieties, see the new releases from the UI Wheat breeding program based in Aberdeen and join the discussion on the latest diseases and issues in cereals. Looking forward to seeing you at one of our field days!

June 27, 2019 - THURSDAY
Rockland / Arbon
9:30 AM Rockland, West of Rock Creek Rd on Deeg Rd, Rockland, ID
2:00 PM Arbon on Mink Creek Road, Arbon, ID

» https://www.uidaho.edu/extension/cereals/scseidaho

» UI_Extension_2019_Cereals_Field_Days_For_Southern_Eastern_ID.pdf

Onion Thrips update 6/22/2019

Onion    Treasure Valley

Onion thrips

Posted on: June 22, 2019 by Stuart Reitz

Below are the monitoring results for this week. Fields were checked Thursday afternoon, Friday, and a few Saturday morning. There are 7 – 10 fields in each area.

Not surprisingly, there’s been a sharp increase in thrips in some areas. In other areas, numbers have held fairly steady. Some of the difference reflects where people are with their insecticide programs. For example, fields that have already received a second Movento application tend to have few immatures. Some of those that haven’t or just had a recent application tend to have more immatures and a higher proportion of immatures relative to adults. One way to see when the residual effect of Movento is declining is to see if the proportion of immatures is increasing.

I did find two Iris yellow spot infected plants this week so be on the lookout for it.

Despite a couple of brisk days this week, the degree days for June have been about the same as last year. For the season, 2019 is a couple of days behind 2018 but still a few days ahead of the historic average.

Adults per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22
Oregon Slope/Weiser 0.03 0.04 0.06 0.15 2.47 4.41
Vale 0.15 0.55 1.64 2.60 4.79 6.44
Ontario 0.07 0.03 0.78 0.71 1.92 4.35
Nyssa 0.02 0.07 1.32 1.03 3.67 5.20
Adrian 0.02 0.22 1.60 1.67 2.15 2.63
Fruitland 0.05 0.03 0.19 0.94 1.29 6.12
Parma - 0.09 1.60 0.67 2.75 7.89
Overall Average 0.06 0.15 1.03 1.11 2.72 5.29

Immatures per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22
Oregon Slope/Weiser 0.00 0.00 0.00 0.26 5.45 12.55
Vale 0.00 0.41 6.28 4.20 11.16 5.99
Ontario 0.00 0.00 3.60 1.71 8.71 22.81
Nyssa 0.00 0.02 3.56 5.52 8.00 10.58
Adrian 0.00 0.00 8.42 3.64 5.45 1.10
Fruitland 0.00 0.00 0.16 2.20 3.39 7.62
Parma - 0.00 1.97 4.37 1.66 2.90
Overall Average 0.00 0.06 3.43 3.13 6.26 9.08

Total average per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22
Oregon Slope/Weiser 0.03 0.04 0.06 0.42 7.92 16.96
Vale 0.15 0.96 7.92 6.79 15.96 12.43
Ontario 0.07 0.03 4.38 2.42 10.63 27.16
Nyssa 0.02 0.09 4.88 6.55 11.67 15.78
Adrian 0.02 0.22 10.01 5.31 7.61 3.73
Fruitland 0.05 0.03 0.35 3.14 4.68 13.74
Parma - 0.09 3.58 5.03 4.41 10.79
Overall Average 0.06 0.21 4.45 4.24 8.98 14.37

% Plants with Thrips
Growing Area 5/15 5/25 5/31 6/8 6/15 6/22
Oregon Slope/Weiser 0% 4% 6% 14% 68% 81%
Vale 0% 31% 64% 54% 81% 83%
Ontario 0% 3% 34% 35% 73% 89%
Nyssa 0% 5% 73% 56% 70% 87%
Adrian 0% 19% 57% 53% 70% 86%
Fruitland 0% 3% 17% 50% 54% 94%
Parma 0% 7% 54% 41% 89% 84%
Overall Average 0% 10% 43% 43% 72% 86%

» Thrips_update_6-22-2019.pdf

Onion Thrips update 6/15/2019

Onion    Treasure Valley

Onion thrips

Posted on: June 16, 2019 by Stuart Reitz

With the warmer weather, thrips numbers continue to increase around the valley, with a greater and greater proportion of plants having thrips on them. The sharp increase in abundance in the Slope / Weiser area are from fields that had not been sprayed yet. Similar increases in other areas reflect fields where counts were taken ahead of an insecticide treatment. Keep in mind that adults continue to come into fields from outside sources so their numbers rebound soon after insecticide applications followed by increases in the immatures. Monitoring fields can help you prioritize and schedule fields for applications.

We have not observed Iris yellow spot virus yet in this season’s crop.

Adults per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15
Oregon Slope/Weiser 0.03 0.04 0.06 0.15 2.47
Vale 0.15 0.55 1.64 2.60 4.79
Ontario 0.07 0.03 0.78 0.71 1.92
Nyssa 0.02 0.07 1.32 1.03 3.67
Adrian 0.02 0.22 1.60 1.67 2.15
Fruitland 0.05 0.03 0.19 0.94 1.29
Parma - 0.09 1.60 0.67 2.75
Overall Average 0.06 0.15 1.03 1.11 2.72

Immatures per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15
Oregon Slope/Weiser 0.00 0.00 0.00 0.26 5.45
Vale 0.00 0.41 6.28 4.20 11.16
Ontario 0.00 0.00 3.60 1.71 8.71
Nyssa 0.00 0.02 3.56 5.52 8.00
Adrian 0.00 0.00 8.42 3.64 5.45
Fruitland 0.00 0.00 0.16 2.20 3.39
Parma - 0.00 1.97 4.37 1.66
Overall Average 0.00 0.06 3.43 3.13 6.26

Total average per Plant
Growing Area 5/15 5/25 5/31 6/8 6/15
Oregon Slope/Weiser 0.03 0.04 0.06 0.42 7.92
Vale 0.15 0.96 7.92 6.79 15.96
Ontario 0.07 0.03 4.38 2.42 10.63
Nyssa 0.02 0.09 4.88 6.55 11.67
Adrian 0.02 0.22 10.01 5.31 7.61
Fruitland 0.05 0.03 0.35 3.14 4.68
Parma - 0.09 3.58 5.03 4.41
Overall Average 0.06 0.21 4.45 4.24 8.98



% Plants with Thrips
Growing Area 5/15 5/25 5/31 6/8 6/15
Oregon Slope/Weiser 0% 4% 6% 14% 68%
Vale 0% 31% 64% 54% 81%
Ontario 0% 3% 34% 35% 73%
Nyssa 0% 5% 73% 56% 70%
Adrian 0% 19% 57% 53% 70%
Fruitland 0% 3% 17% 50% 54%
Parma 0% 7% 54% 41% 89%
Overall Average 0% 10% 43% 43% 72%

» Thrips update 6/15/2019

Potato Psyllids in the Treasure Valley

Potato    Treasure Valley

Posted on: June 14, 2019 by Stuart Reitz

Potato psyllids detected in the Treasure Valley.

The potato pest monitoring network in Malheur County found potato psyllids in 45% of checked fields last week (Traps were placed May 31 and collected June 7). A total of 21 psyllids were collected this past week from the 20 fields currently in the monitoring network. The psyllids will be tested for the Zebra Chip bacterium.

For information on psyllid and other pest management in potatoes, please see the 2019 Integrated Pest Management Guidelines for Insects and Mites in Idaho, Oregon and Washington Potatoes, available at http://www.nwpotatoresearch.com/pest-library/pest-management-options/.

» http://www.nwpotatoresearch.com/pest-library/pest-management-options/

Potato herbicide solubility and effects - Spring 2019

Potato    All Locations

Posted on: June 12, 2019 by Pamela Hutchinson

Rainfall across southern Idaho this spring has been unusually high in some areas and potato herbicides may have been or are being affected. Soluble herbicides can move downward in soil profile. Availability of herbicides for uptake can increase. What is happening with your potato herbicides and why? What is happening to your weeds and potatoes and why?

» Potato_herbicide_solubility_and_movement_-_Spring_2019.pdf

Ag Talk Tuesday - the latest UI Ag Talk Report

All Crops    All Locations

Regional Crop Diseases

Posted on: June 11, 2019 by Juliet Marshall

Here’s what you missed at the June 4 Ag Talk Tuesday in American Falls… and other Hot Topics (See attached PDF):
NEW CALL-IN NUMBER FOR AG TALK TUESDAY SESSIONS
Have instant access to UI ag faculty and other attendees remotely during the Ag Talk Tuesday sessions. You can simply call a phone number to join the meeting, or you can click on the Zoom link below (the needed software will automatically download when you start or join your first Zoom meeting) to ask any questions you have or to share your observations with how crops are progressing and what current issues appear to be in your region.

The next Ag Talk Tuesday will be held 8:00 AM July 2 in Rexburg at Idaho AgCredit, 1586 North 2nd East.

Call-in Number: (669) 900-6833
Meeting ID: 349427773

(Optional) Zoom link: https://uidaho.zoom.us/j/349427773

» ATT_v1i3-CURRENT__.pdf

Onion Thrips update 6/8/2019

All Crops    All Locations

Onion thrips

Posted on: June 10, 2019 by Stuart Reitz

Hello Everyone,

There hasn’t been a tremendous increase in thrips abundance this week as insecticide programs are ramping up. The rain and wind has also helped to slow population build up. (Thrips tend not to fly in windy conditions and rain can drown or wash them off plants). Fields were checked this week in between thunderstorms on Thursday and Friday and couple on Saturday.

Highest numbers again were in larger early season varieties and in reds. The highest numbers I saw on individual plants ranged from 50 – 90 thrips. Still, those numbers have been sporadic. Other plants within the same field had as few as 1 and nearby fields with smaller plants may have few if any thrips. The bottom line is to check as many plants as possible when scouting your fields.

I have not seen any plants infected with Iris yellow spot virus (yet). Pink root symptoms have been showing up in some red onion fields. At this point, reducing stress on plants (e.g. good irrigation practices) is the best way to limit the impact of the disease.

Adults per Plant
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0.03 0.04 0.06 0.15
Vale 0.15 0.55 1.64 2.60
Ontario 0.07 0.03 0.78 0.71
Nyssa 0.02 0.07 1.32 1.03
Adrian 0.02 0.22 1.60 1.67
Fruitland 0.05 0.03 0.19 0.94
Parma - 0.09 1.60 0.67
Overall Average 0.06 0.15 1.03 1.11

Immatures per Plant
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0.00 0.00 0.00 0.26
Vale 0.00 0.41 6.28 4.20
Ontario 0.00 0.00 3.60 1.71
Nyssa 0.00 0.02 3.56 5.52
Adrian 0.00 0.00 8.42 3.64
Fruitland 0.00 0.00 0.16 2.20
Parma - 0.00 1.97 4.37
Overall Average 0.00 0.06 3.43 3.13

Total average per Plant
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0.03 0.04 0.06 0.42
Vale 0.15 0.96 7.92 6.79
Ontario 0.07 0.03 4.38 2.42
Nyssa 0.02 0.09 4.88 6.55
Adrian 0.02 0.22 10.01 5.31
Fruitland 0.05 0.03 0.35 3.14
Parma - 0.09 3.58 5.03
Overall Average 0.06 0.21 4.45 4.24

% Plants with Thrips
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0% 4% 6% 14%
Vale 0% 31% 64% 54%
Ontario 0% 3% 34% 35%
Nyssa 0% 5% 73% 56%
Adrian 0% 19% 57% 53%
Fruitland 0% 3% 17% 50%
Parma 0% 7% 54% 41%
Overall Average 0% 10% 43% 43%


As always, please let me know if you have any questions.

**********************************************
Stuart Reitz
Malheur Experiment Station
Oregon State University
595 Onion Ave.
Ontario, OR 97914
Office: 541-889-2174
Mobile: 208-740-4381
stuart.reitz@oregonstate.edu
**********************************************

Ag Talk Tuesday - American Falls, 8:00 AM June 4, at Idaho AgCredit

All Crops    All Locations

Ag Talk Tuesday

Posted on: June 3, 2019 by Juliet Marshall

Good afternoon! We will be having the next ATT meeting tomorrow morning at 8:00 AM at the Idaho AgCredit Office, 2883 ID-39, American Falls, ID.

New Call-in number for Ag Talk Tuesday sessions:

Have instant access to UI ag faculty and other attendees remotely during the Ag Talk Tuesday sessions. You can simply call a phone number to join the meeting, or you can click on the Zoom link below (the needed software will automatically download when you start or join your first Zoom meeting) to ask any questions you have or to share your observations with how crops are progressing and what current issues appear to be in your region.

Call-in: (669) 900-6833

Zoom link: https://uidaho.zoom.us/j/349427773

Attached is the summary of the last ATT discussion - what we are calling the Ag Talk Report.
Date Location Primary Topics
Hosts

June 4
Idaho AgCredit
2883 ID-39
American Falls

Early season potato issues, stand issues
Weed issues
Grain Issues

Kasia Duellman
Pam Hutchinson
Juliet Marshall

» ATT_v1i2.pdf

2019 Snake River Weed Research Tour, Ontario, OR

All Crops    All Locations

Posted on: June 3, 2019 by Jerry Neufeld

Please mark your calendar for the 2019 Snake River Weed Research Tour
Venue: Malheur Experiment Station, 595 Onion Ave, Ontario, OR
Date: Thursday, June 13, 2019
Registration starts at 8:00am with coffee and donuts.
Recertification credits: 3 credits – Oregon and 3 credits – Idaho for full tour attendees.

The tour will start promptly at 8:30AM and end at 12:15PM.

A complementary lunch will be served at the conclusion of the tour.

The tour will feature research studies for weed management in direct-seeded onion, sugar beet, field corn, potato, and wheat. The first stop will be at our yellow nutsedge “field laboratory” along OR Hwy 201 just after crossing the rail tracks (if headed south to Nyssa from Ontario). The stop along Hwy 201 will feature studies on yellow nutsedge control in onion, sugar beet, and field corn. We will then proceed to the station and tour studies on weed control in direct-seeded onion, field corn, potato, and wheat.

This event is open to the public. Please forward the invitation to anybody who will be interested in weed management in the mentioned crops.

We will follow up with a reminder as we get close to the tour date. We are looking forward to seeing you at the tour.

Please call 541-889-2174 or email janet.jones@oregonstate.edu if you need more information.

Kind regards,


Joel Felix

Onion Thrips update

Onion    Treasure Valley

Onion thrips

Posted on: June 1, 2019 by Stuart Reitz

We had a sharp increase in thrips numbers in most areas over the past week. Fields were checked on Thursday and Friday (5/30 – 5/31). Thrips were in 90% of the fields checked this week and are being found on more plants per field now. The overall increase was largely a result of thrips beginning to reproduce in fields (as marked by the increase in immature thrips). Numbers tend to be higher in fields with larger plants. The highest numbers have been in red onion fields with plants at the 4-5 leaf stage and in early onion fields (e.g. Spanish Medallion and other early varieties). The highest numbers in the network were about 32 per plant in a red onion field (about 85% being immatures). The lowest numbers have been in fields at the 1-2 leaf stage, especially those in the Oregon Slope/Weiser area.

Expect additional movement of thrips into onion fields as more alfalfa fields get their first cutting and as rangeland weeds begin to dry down and senesce. Populations will increase rapidly with the warmer, drier weather in the forecast.

Adults per Plant
Growing Area 5/15 5/25 5/31
Oregon Slope/Weiser 0.03 0.04 0.06
Vale 0.15 0.55 1.64
Ontario 0.07 0.03 0.78
Nyssa 0.02 0.07 1.32
Adrian 0.02 0.22 1.60
Fruitland 0.05 0.03 0.19
Parma - 0.09 1.60
Overall Average 0.06 0.15 1.03

Immatures per Plant
Growing Area 5/15 5/25 5/31
Oregon Slope/Weiser 0.00 0.00 0.00
Vale 0.00 0.41 6.28
Ontario 0.00 0.00 3.60
Nyssa 0.00 0.02 3.56
Adrian 0.00 0.00 8.42
Fruitland 0.00 0.00 0.16
Parma - 0.00 1.97
Overall Average 0.00 0.06 3.43

Total average per Plant
Growing Area 5/15 5/25 5/31
Oregon Slope/Weiser 0.03 0.04 0.06
Vale 0.15 0.96 7.92
Ontario 0.07 0.03 4.38
Nyssa 0.02 0.09 4.88
Adrian 0.02 0.22 10.01
Fruitland 0.05 0.03 0.35
Parma - 0.09 3.58
Overall Average 0.06 0.21 4.45

% Plants with Thrips
Growing Area 5/15/2019 5/25/2019 5/31/2019
Oregon Slope/Weiser 3% 4% 6%
Vale 15% 31% 64%
Ontario 7% 3% 34%
Nyssa 2% 5% 73%
Adrian 2% 19% 57%
Fruitland 5% 3% 17%
Parma - 7% 54%
Overall Average 6% 10% 43%



A couple of notes unrelated to onion thrips
1 – As a result of the cool, wet spring, downy mildew has shown up in some overwinter onions in the Columbia Basin. I haven’t seen signs of it in the Treasure Valley, but it’s worth keeping an eye out for it. Even with the wet weather, I don’t think the bulb crop is at high risk since the crop is relatively small and doesn’t have a dense canopy yet that keeps moisture levels high on the leaves. It could be a greater risk for seed crops that have a denser canopy now. Please let me know if you have concerns about it in your fields.


Thanks to Carrie Wohleb and Lindsey du Toit for the pictures of downy mildew on onion foliage and flower scapes.

2 – if you have sugarbeets, there have been reports of leafminer and armyworms in beet fields.

3 –June 13 2019: Snake River Weed Research Tour, Malheur Experiment Station, 595 Onion Ave, Ontario, OR, beginning at 8:30 AM
http://www.cropinfo.net/events.php

» Thrips update 5/31/2019

Annual University of Idaho Snake River Weed Management Tour - June 25th - Aberdeen R&E Center

Potato    All Locations

Posted on: May 30, 2019 by Pam Hutchinson

Greetings;



Please mark your calendars and plan to attend the UI Snake River Pest Management Tour at the Aberdeen R&E Center on Tuesday June 25th.

Time: 8:30 to noon followed by a sponsored lunch.

Credits: Three Idaho pesticide applicator recertification credits will be offered.



Featured will be several weed control trials in potatoes, including tank mixtures, planned vs. rescue postemergence applications, chemigation vs sprinkler incorporation as well as potato variety herbicide tolerance trials, herbicide mechanism of action plots, and Litchi tomato herbicide management.



We hope to see you there.



Thanks,

Pam

p.s. This tour was originally scheduled for June 18th but due to cold rainy conditions, our potato and weed emergence has been slowed considerably

There will be no Snake River Tour at the Kimberly R&E Center this year – we plan to fire it up again in 2020!