Selectivity of insecticide to the earwig, Euborellia annulata (Fabricius), predatory to the Asian corn borer, Ostrinia furnacalis (Guenee)
1990
Javier, P.A. | Rejesus, B.M. (Philippines Univ., Los Banos, College, Laguna (Philippines). National Crop Protection Center)
Eight insecticides of different chemical structures were evaluated for selectivity to the earwigs. The toxicity of the different insecticides to the corn borer decreased as follows: cypermethrin monocrotophos = deltamethrin chlorpyrifos ethyl + BPMC = carbofuran carbaryl = methomly = endosulfan, while the adverse effects of the insecticides to the predatory earwig decreased as follows: monocrotophos deltamethrin cypermethrin chlorpyrifos ethyl + BPMC carbofuran methomyl = carbaryl endosulfan. Determination of the selectivity ratio suggested that carbofuran and cypermethrin are the most selective insecticides to the earwig. Based on the company's recommended rates, chlorpyrifos ethyl + BPMC, carbofuran and endosulfan were highly toxic to the larvae of corn borer while endosulfan was highly toxic to the earwig followed by chlorpyrifos ethyl + BPMC.
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