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Onion Thrips Management Recommendations for 2018

Ethan Grundberg, Vegetable Specialist
Eastern New York Commercial Horticulture

June 7, 2018

Most larger scale onion growers in the region are already familiar with Dr. Brian Nault's insecticide sequence recommendations for onion thrips management. However, more products have been registered in New York in the last few years that provide alternative options for conventional thrips management (specifically Exirel and Minecto Pro). It's worth keeping in mind that Dr. Nault's recommendations are based on two primary principles:

 

  • Scouting and only spraying at threshold: The days of calendar sprays are long gone. Given the cost of some of the newer chemistries used for thrips management, growers must scout fields and confirm that thrips populations have reached a level of at least an average of 1 thrips per leaf before spraying. Spraying before thresholds are reached not only weakens the resistance management strategy (see point 2), but also cuts into grower profits by unnecessarily increasing the number of insecticide applications each year.


  • Resistance management: Onion thrips produce multiple generations each year. They also develop resistance to insecticides more readily than other pests that reproduce more slowly.  One of the goals of the recommended insecticide sequence is to avoid exposing multiple generations per year to the same insecticide. By avoiding the exposure of multiple thrips generations to the same active ingredients in the same year, growers can help preserve the useful life of insecticides that are effective at managing thrips.

 

The chart that follows outlines several different insecticide sequences developed by Dr. Nault for growers to follow depending upon the severity of thrips pressure in the field. It should be noted that, as indicated below, Minecto Pro is a pre-mix of the same active ingredients found in Agri-Mek and Exirel, so it should NOT be used in sequence with those products. Addtionally, almost all of the insecticides listed in the chart should be used with a non-ionic penetrating surfactant, such as Dyne-Amic or LI700. Only Warrior and Lannate are compatible with spreader-sticker type adjuvants. Since Bravo Weatherstik is formulated with a sticker, it should NOT be mixed with Movento, Minecto Pro, Radiant, Exirel, or Agri-Mek.

This article was published in the June 7th 2018, ENYCHP Vegetable News.  Click here to view the full newsletter.

 

Thrips Management




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Apples

Apples

Apricots

Apricots

Asparagus

Asparagus

Beets

Beets

Blueberries

Blueberries

Broccoli

Broccoli

Brussels Sprouts

Brussels Sprouts

Cabbage

Cabbage

Carrots

Carrots

Cauliflower

Cauliflower

Cherries

Cherries

Cucumbers

Cucumbers

Dry Beans

Dry Beans

Eggplant

Eggplant

Ethnic Vegetables

Ethnic Vegetables

Garlic

Garlic

Grapes

Grapes

Horseradish

Horseradish

Kohlrabi

Kohlrabi

Leeks

Leeks

Lettuce / Leafy Greens

Lettuce / Leafy Greens

Melons

Melons

Nectarines

Nectarines

Onions

Onions

Parsnips

Parsnips

Peaches

Peaches

Pears

Pears

Peas

Peas

Peppers

Peppers

Plums

Plums

Potatoes

Potatoes

Pumpkins / Gourds

Pumpkins / Gourds

Radishes

Radishes

Raspberries / Blackberries

Raspberries / Blackberries

Rhubarb

Rhubarb

Rutabaga

Rutabaga

Snap Beans

Snap Beans

Squash - Summer

Squash - Summer

Squash- Winter

Squash- Winter

Strawberries

Strawberries

Sweet Corn

Sweet Corn

Sweet Potatoes

Sweet Potatoes

Tomatoes

Tomatoes

Turnips

Turnips

more crops

Upcoming Events

Biocontrol Trial and IPM Field Meeting

August 20, 2019
4pm-6pm
Fort Plain, NY

4-5 pm: Dr's Amara Dunn and Meg McGrath will discuss powdery mildew control using biocontrols and organic and conventional fungicides.  Crystal Stewart from the ENYCHP will provide a tour of the biocontrol trial and additional squash and pumpkin mini-variety trial.

5-6pm: Walk the farm fields with Dr's Dunn and McGrath and with CVP specialist Elizabeth Buck to talk about integrated strategies to control pests, diseases, and weeds on the vegetables farm.  Bring samples and questions!

6-?pm: Discussion and light refreshments 

*Look for the CCE sign to park on a cross street right before the farm.

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Ag Manager Webinar Series: Ag Tax Topics - Sales Tax and Property Tax Issues for Ag in NYS

August 27, 2019
12:30 - 12:50pm

Join Liz Higgins from the CCE ENYCHP every other Tuesday at 12:30pm throughout the summer as she discusses pertinent business topics for busy farm managers.
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Willsboro Farm High Tunnel Twilight Meeting

August 27, 2019
5:00pm - 7:00pm
Willsboro, NY

Join vegetable specialists Elisabeth Hodgdon, Jud Reid, and farm manager Mike Davis for a high tunnel and field tour at Cornell's Willsboro Research Farm, where they will share research results for the following projects: 
  • Striped cucumber beetle management suing netting and row cover
  • Varietal differences in cucumber susceptibility to striped cucumber beetle
  • Ground cherry and goldenberry production in field and high tunnel environments
  • Overwintered high tunnel spinach nitrogen fertility 

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Announcements

Resources from CCE ENYCHP!

We are developing new ways to connect with the CCE ENYCHP team this year! We have a Youtube page located at this link. Check out videos on Table Grape Production, Pest Updates and the 20 Minute Ag Manager - in 4 Minutes series

We have a Facebook Page here as well as an Instagram page. We keep these places updated with current projects, events, and other interesting articles and deadlines.

There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

The text alerts will be reserved for important crop alerts that could impact management decisions immediately. For instance, if there were an outbreak of Late Blight in the area, this would be transmitted to vegetable growers.

Farmers can choose the crop for which they wish to receive updates. Additionally they can request that Ag Business Alerts be sent to them. These alerts might include due dates for crop insurance deadlines, market opportunities etc.

If you have questions, please contact enychp@cornell.edu


Podcasts

Biweekly Vegetable News Podcast - Episode 8 - 08/07/19

August 7, 2019
The August 7th, 2019 edition of the Eastern New York Vegetable News covers the following topics:

Cover Crop Options for Late Summer (1:28)
Plectosporium and Angular Leaf Spot of Cucurbits (5:57)
Tomato Caterpillar Pests and a Late Blight Update (14:39)
New York State Bill to Eliminate the Use of Chlorpyrifos (22:25)
Basil Downy Mildew Management (24:04)
Garlic Anthracnose and Bacterial Issues in Onions Grown on Plastic (28:20)
Offering Retirement Benefits on the Farm (33:10)
Salt Water Flotation Test for Spotted Wing Drosophila (35:08)
Farm Labor Housing Update (39:45)

Here are links to additional resources mentioned in the episode:

Tomato Blight Alerts and Updates:
http://usablight.org/

Basil Downy Mildew
Dr. Meg McGrath: 631-727-3595 or mtm3@cornell.edu
http://vegetablemdonline.ppath.cornell.edu/NewsArticles/BasilDowny.html http://blogs.cornell.edu/livegpath/extension/basil-downy-mildew/

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