Effects of thiamethoxam in sublethal concentrations, on life expectancy (ex) and some other biological characteristics of Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae)

ABSTRACT: Hippodamia variegata Goeze (Coleoptera: Coccinellidae), is an important aphidophagous predator that is noticeable in IPM as a suitable biological control agent. In this study, influence of sublethal concentrations (LC10 and LC30) of a neonicotinoid insecticide, thiamethoxam, was evaluated on some of life parameters of this beneficial insect. Results showed that thiamethoxam changed life expectancy (ex), and declined age-specific fecundity (mx). The insecticide, decreased preadult development time significantly, but it didnʹt have any effect on adult developmental period. Also, Eggs fecundity and fertility didnʹt changed in treatments. According to this study, although thiamethoxam is approximately safe for the ladybird, more care should be taken when it is used in IPM programs.