Effects of insecticides on the diamondback moth, Plutella xylostella (Linnaeus), collected from Komatsuna greenhouse in Wakayama

Abstract

The control effects of 14 insecticides on the diamondback moth, Plutella xylostella (Linnaeus), collected from Komatsuna, Brassica rapa L.var. perviridis, in Wakayama City, were investigated at 3rd instar larvae using the leaf-dipping method. Spinetoram, spinosad, emamectin benzoate, and two BT-insecticides exhibited high insecticidal activity. Flufenoxuron, chromafenozide, cypermethrin, chlorantraniliprole, and flubendiamide had low efficacity. Lepimectin showed relatively low efficacy on the 4th day after treatment, but all individuals died later. Mortality rates associated with lepimectin, pyridalyl, metaflumizone, and chlorfenapyr in the Nagusa population were lower than these in the Kasei population.