Toxicities of insecticides to cotton ballworm, Helicoverpa armigera (Hübner) collected from chrysanthemum fields in Nara prefecture

Abstract

Seven insecticides were treated against cotton ballworm larvae with kidney bean leaves. Two days after treatment, all insecticides were found to have high toxicity at commercial and 1/10 of this concentrations. It was thought that chemical control of cotton ballworm can be accomplished using rotation spray of these insecticides.