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Scouting Tips for Onion Thrips in Onions

Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program

Last Modified: July 1, 2023

To find the first thrips of the season, look deep into the leaf axils. Inspect 20 to 30 plants and count the total number of onion thrips (OT) per plant and divide by the average number of leaves per plant to get the number of OT per leaf. Thrips feeding causes silvery streaking along the leaves. If you can already see thrips feeding damage that is also a good indication that it is time to spray. If there is a lot of feeding damage, than you likely missed a timely first spray.

Close-up of the leaf axil of a 5-leaf onion plant that is spread open. Five tiny brown Adult onion thrips are the first thrips of the season. They are tiny brown, sliver-like insects up to 2 mm in length. Photo by C. Hoepting, CCE Cornell Vegetable Program


Close-up of onion leaf axil zooming in on about 30 tiny 0.5 to 1.2 mm in length light yellow slender thrips in a cluster.Onion thrips nymphs are yellow and 0.5 to 1.2 mm in length. Photo by Whitney Cranshaw, Colorado State University.
Side view of an onion plant. Pale green dashes from thrips feeding creates a streaked look to the leaves.Subtle streaking along leaves is an early indication of early onion thrips feedling. This plant has reached the spray threshold. Photo by C. Hoepting, CCE Cornell Vegetable Program




Scouting Tips for Onion Thrips in Onions (pdf; 239KB)

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September 24, 2024
Stafford, NY

Get updated! At this on-farm meeting, hear updates in Western bean cutworm monitoring and management, white mold management, weeds and herbicides, and insights from the dry bean variety trial. 1.5 DEC credits will be available in categories 1a, 10, 21, and 23. 

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New Onion Resources Available

Attention onion growers! We've posted several new resources on the ONION page
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  • Scouting for Botrytis Leaf Blight Halo Lesions
  • Video: How to Identify Foliar Symptoms of Bacterial Disease in Onion
  • A New Pest for the New Year in WNY: Allium Leafminer is Here to Stay
  • Scouting Tips for Onion Thrips in Onions


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