Insecticide resistance inFrankliniella occidentalis: Corroboration of laboratory assays with field data and cross-resistance in a cypermethrin-resistant strain |
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| Authors: | Fatih Da?l? Irfan Tunç |
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| Institution: | (1) Plant Protection Department, Faculty of Agriculture, Akdeniz University, Antalya, Turkey |
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| Abstract: | Field efficacy of five insecticides to a greenhouse strain ofFrankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) of known resistance status was studied. In a greenhouse trial, the mortality of aF. occidentalis strain (Uncali) which exhibited resistance only against cypermethrin in laboratory assays, reached 56%, 68%, 82%, 94% and
99%, 24 h after application of abamectin, cypermethrin, endosulfan, malathion and methomyl, respectively. In the laboratory,
for larval mortality equal to that achieved in the field, much lower doses — half of the field dose of cypermethrin and endosulfan,
and one-third and one-sixth of malathion and methomyl, respectively, were required in topical application. Because of differences
between laboratory and field responses ofF. occidentalis to insecticides, a sound resistance evaluation program to determine field efficacy of insecticides is needed. Resistance
increased 28.0- and 139.3-fold at LC50 in theF. occidentalis strain subjected to 27 and 44 cycles of cypermethrin selection, respectively. A slight cross-resistance of two- to threefold
was found with endosulfan, malathion and methomyl and no cross-resistance was observed with abamectin.
http://www.phytoparasitica.org posting August 4, 2008. |
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| Keywords: | Abamectin bioassays endosulfan malathion methomyl western flower thrips |
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