Effect of two temperatures on biological traits and susceptibility to a pyrethroid insecticide in an exotic and native coccinellid species

摘要: The Asian ladybird Harmonia axyridis (Pallas) (Coleoptera Coccinellidae), an active predator of aphids and other insect pests, has long been used as a biocontrol agent deliberately or accidentally introduced into many countries. Over the last few decades concerns have raised about its invasiveness in those areas where it introduced. A test was carried out to investigate the ability H. survive, grow reproduce at higher temperatures (30 °C) than recorded optimum 25 °C. In preliminary experiment, temperature 35 °C also tested, but subsequently excluded, because all eggs were dehy-drated. placed 30 hatched, considerably lower rate compared with control eggs. This re-sulted faster larval overall development temperature. Adult weight reproductive parameters adversely affected particular, fecundity fertility dramatically for females reared maintained tested had thus negative impact on performance. A second experiment designed effects pyrethroid insecticide (λ-Cyhalothrin) comparison Adalia bipunctata (L.), species commonly found Europe. Larval mortality suggested that axyridis less susceptible A. λ-Cyhalothrin. Further studies are needed better evaluate this pesticide treatments exotic vs . native ladybirds, under field conditions, factors may play key role.