During the 2001 growing season, onion thrips populations were collected from 19 different sites encompassing the major onion growing areas of New York and assayed for resistance to lambda-cyhalothrin (Warrior T). We used a new procedure- Thrips Insecticide Bioassay System (TIBS)- in which thrips are collected directly from the field into insecticide-treated vials which vary in dose. Mortality is read at 24 hrs. The LC50 values for immature thrips from the sites varied between <1 to >1,000 ppm. Mortality at 100 ppm, a common field rate, varied between 9 and 100%. Estimates of susceptibility to lambda-cyhalothrin using the TIBS method compared favorably to on-farm field trials. We are currently developing TIBS for other insecticides and believe the use of TIBS can help growers select, in a timely fashion, the insecticides which can be used effectively in their fields.
Species 1: Thysanoptera Thripidae Thrips tabaci (onion thrips)
Keywords: insecticide resistance
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