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Development of a bioassay system for monitoring susceptibility in Thrips tabaci by Alfredo Rueda; Anthony M Shelton is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract A system is described for collecting adult and larva of __Thrips tabaci__ from onion foliage into insecticide‐treated vials to evaluate susceptibility to insecticides. The thrips insecticide bioassay system (TIBS) allows one to treat vials and store them for 3 weeks before thrips are collected. Depending on the population density in the field, collection of the insects for the test required from 3–6 h for one person. Assays are read after 24 h. This system was used in 1997 and 1998 in commercial onion fields in Honduras and Nicaragua, and TIBS was sensitive enough to detect differences to the insecticides tested, to thrips life stages and to different generations within an onion‐growing season. Data collected suggest that there were not serious problems with thrips insecticide resistance, with the possible exception of cypermethrin in Nicaragua which had a resistance ratio (RR) value of 26.9 for adult thrips. The largest RR values were observed at the end of the growing season, and this may be caused by the season‐long selection by insecticide sprays. The mortality of adults and larvae followed the same general pattern, but the ratio between larvae and adults differed f

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Author

Alfredo Rueda; Anthony M Shelton

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1526-498X)

Published

2003

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)