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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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Upcoming Events

Vegetable Pest and Cultural Management Meeting for Auction Growers (Ontario)

Event Offers DEC Credits

June 27, 2023
Rushville, NY

This on-farm meeting will feature pest management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables, primarily for those growing for wholesale auction. A hands-on demonstration of weed, insect and disease identification in vegetables including management options such as inter-row cover crops, grafting and, where appropriate, spray options will be used to educate growers. Details on each topic will focus on field observations at the farm.

DEC recertification credits will be offered (1.75 credits in categories 10, 1a, 23, 24). 

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Vegetable Pest and Cultural Management Meeting for Auction Growers (FLPA)

Event Offers DEC Credits

July 12, 2023
Penn Yan, NY

This meeting will feature pest management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables, primarily for those growing for wholesale auction. A hands-on demonstration of weed, insect and disease identification in vegetables including management options such as inter-row cover crops, grafting and, where appropriate, spray options will be used to educate growers. 

DEC recertification credits will be offered (1.75 credits in categories 10, 1a, 23, 24). 

view details

Vegetable Pest and Cultural Management Meeting for Auction Growers (Seneca)

Event Offers DEC Credits

August 2, 2023
Romulus, NY

This meeting will feature pest management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables, primarily for those growing for wholesale auction. A hands-on demonstration of weed, insect and disease identification in vegetables including management options such as inter-row cover crops, grafting and, where appropriate, spray options will be used to educate growers. 

DEC recertification credits will be offered (1.75 credits in categories 10, 1a, 23, 24). 

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Announcements

Ag Water Test Sample Drop-Off Sites in WNY

If you are curious about the quality of your irrigation ponds, streams, wells, or other surface water source, water testing is an important tool to consider. Getting the right test and doing so in a timely manner has been a challenge. Water testing that provides meaningful results requires a quantified generic E. coli test or an Enumeration E. coli test. Some water testing labs only do a potable water test called a presence/absence test. The Enumeration test provides test results as in numbers of (bacterial) colony forming units (CFU or most probable number MPN). Having a number allows you to track the results with a comparable baseline. Each water source should be tested 3-4 times a season and do this each growing season.

Water testing drop-off/pick-up sites have been set up in a number of locations across the region by Lozier Environmental Consulting in Rochester. Water test sample bottles, forms, and information are available at each site. Additional sites are available:
  • A new site has been added in the greater Lockport (Niagara County) area: Flint Brothers Hardware, 2769 Main St, Newfane, NY, 716-778-9654. Samples must be received at this location by Wednesday 9:00am.
  • If you are in Ontario County, contact Nancy Anderson at the CCE Ontario County office in Canandaigua at 585-394-3977 x427. You can pick up the supplies (forms, bottles, instructions, and takes payment) at the CCE office. You will be required to take your sample(s) to a drop-off site in Canandaigua; the bottles will be picked up and delivered to Life Science Labs in Syracuse for analysis.
For assistance in understanding the water test results, contact Robert Hadad or the lab.


New Ag Climate Factsheet Released

The intersection of agricultural production and greenhouse gases is gathering increasing attention. This is an opportune time to consider how vegetable production interacts with carbon sequestration and greenhouse gas emissions, and how using cover crops may alter this picture.

The factsheet, Greenhouse Gases and Soil Organic Carbon in Vegetable Production and the Role of Cover Crops, written by Zach Spangler, Ag Climate Resiliency Specialist with CCE Harvest NY, and Elizabeth Buck, Fresh Market Vegetable Specialist, CCE Cornell Vegetable Program, discusses:
  • Sequestration of atmospheric carbon in agricultural soils as soil organic carbon (SOC). Is vegetable production impacting SOC?
  • Net greenhouse gas emissions of carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4) from the soil.
  • Impact of cover crops on soil organic carbon, nitrous oxide emissions, and other GHG emissions.


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