Biological control of pest insects by the spined soldier bug, Podisus maculiventris (Say), is severely impacted by the early season application of pyrethroids to alfalfa, cotton, soybeans, vegetables, and other crops. The time required for P. maculiventris adults to recolonize treated areas allows buildup of pest insect populations, and thus decreases the effectiveness of this generalist predator in IPM programs. P. maculiventris nymphs and adults exhibited extreme sensitivity to the pyrethroids cyfluthrin and lambda-cyhalothrin. Eight generations of laboratory selection increased resistance to cyfluthrin 170 fold, to an LC50 of 0.16 mg/L. Similarly, 8 generations of selection increased resistance to lambda-cyhalothrin from less than 1 ug/L to an LC50 of 0.18 mg/L. Resistance to both pyrethroids was abolished by addition of the synergist piperonyl butoxide, suggesting that cytochrome P450 mediates resistance in this species. Both cyfluthrin- and lambda-cyhalothrin-selected colonies exhibited cross resistance to either compound. Additionally both colonies exhibited cross resistance to bifenthrin, zeta-cypermethrin, permethrin, and deltamethrin.
Species 1: Heteroptera Pentatomidae Podisus maculiventris (spined soldier bug)
Keywords: cyfluthrin resistance, cross-resistance
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