|Authors: ||J. Contreras, D. Moreno, M.D. Hernández, P. Bielza, A. Lacasa|
|Keywords: ||thrips, bioassays, resistance level|
The resistance to more frequently used insecticides shown by two populations of Frankliniella occidentalis is compared by means of bioassays: one of them taken from a plastic-house without treatment against thrips and the other one from a plastic-house with monitored treatment.
The difference between populations and its variation throughout time are discussed.
At mid-season, when both the populations were treated with deltamethrin and chlorpyrifos-methyl no differences were found, although the populations from the plastic-house with monitored treatment showed resistance to acrinathrin, methamidophos, endosulfan and formetanate.
At end-season the result was an increase in sensitivity of this population for all the tested insecticides, and the only case of resistance was to endosulfan.
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