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Onion Thrips Management Guidelines for Onion: Using Foliar-Applied Insecticides

Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program

June 17, 2026

The 2026 Onion Thrips Management Guidelines for Onion: Using Foliar-Applied Insecticide Products are designed to optimize onion thrips management in onion and to mitigate risk of insecticide resistance. Information herein is based on insecticide resistance management principles (IRAC: Insecticide Resistance Action Committee) and years of experience evaluating efficacy of insecticides used for managing onion thrips infestations in small-plot onion field trials in commercial fields, primarily in western New York. Other insecticides (generics and other active ingredients) are also available and may be effective against onion thrips and could be substituted for the products listed here. Information below provides context for these guidelines. These Guidelines do NOT consider managing onion thrips in order to reduce incidence of iris yellow spot virus.



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Announcements

Cornell Crop and Pest Management Guidelines Paused

From Cornell IPM:

Highlighting its commitment to quality and long-term sustainability, Cornell Integrated Pest Management's Pesticide Safety Education Program has announced
a pause in production of the 2026 Cornell Crop and Pest Management Guidelines.

Cornell IPM Director Alejandro Calixto said this temporary measure is the result of a comprehensive reimagining process facilitated by Illume Projects of Ithaca, which included end-user interviews, internal surveys and sales data analytics.

"It became clear to us that we cannot continue producing the guidelines and fully restructure them at the same time," Calixto said. "By pausing production, we can dedicate all available resources and time to rebuilding the production process, ensuring that when we re-launch in 2027, the guidelines will reflect a modernized approach built around the grower and other user experience."

A series of annually updated reference manuals produced by Cornell IPM and the College of Agriculture and Life Sciences (CALS), the Cornell Crop and Pest Management Guidelines are widely used by farmers, agronomists, crop consultants and extension educators in New York and throughout the Northeast. They include information about current IPM recommendations, pesticide options, cultural practices, nutrient management, disease, insect and weed identification and resistance-management strategies.

Calixto and Pesticide Safety Education Program Lead Mike Helms will spearhead efforts to restructure the guideline process over the next 12 months, with a goal of launching a more streamlined, user-friendly version in 2027.

Limited copies of the 2025 guidelines remain available for purchase while supplies last through The Cornell Store. The 2026-2027 Greenhouse Guidelines will be available.

For more information contact Helms at mjh14@cornell.edu.


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