Effects of insect growth-regulator insecticides on the immature stages of Harmonia axyridis (Coleoptera: Coccinellidae)

Ecotoxicology and Environmental Safety
Falin HeXingyin Jiang

Abstract

Harmonia axyridis is an important biological control predator in greenhouses and agricultural fields, and it plays a significant role in the integrated pest management (IPM) of several arthropod pests. We studied the effects of eight insect growth-regulator insecticides (IGRs) on immature stages of H. axyridis by residual toxicity (eggs and pupae) and contact toxicity (larvae) to evaluate the risk of using these IGRs in IPM systems. Diflubenzuron, hexaflumuron and lufenuron caused more than 80% mortality to H. axyridis eggs, larvae and pupae, respectively. Pyriproxyfen was also highly harmful to larvae and pupae of H. axyridis. In contrast, methoxyfenozide and buprofezin caused little mortality and were classified as slightly harmful to immature stages based on a reduction coefficient. In addition to mortality and developmental time, the fecundity, fertility and deformed eggs of offspring were affected, when the predators were exposed to IGRs. Benzoylphenylurea insecticides significantly reduced H. axyridis female fecundity and fertility and increased the number of deformed eggs. The adverse effects are closely connected with the developmental stages of the predators and types and methods of insecticides exposed. All IGRs affec...Continue Reading

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