Jun Wang, Daqiang Yin, G. Lu
Nov 1, 1999
Citations
0
Influential Citations
12
Citations
Journal
Pesticide Science
Abstract
Dimehypo (disodium 2-methylaminotrimethylene di thiosulfonate), is an insecticide used on rice and other crops in China. However, contamination of mulberry leaves with this has been implicated in a reduction of silk production. The acute and chronic toxicity of dimehypo to Bombyx mori L over the partial life cycle of the organism was determined based on survival, growth and cocooning of two strains of silkworm larvae. A change in the ultrastructure of the posterior silk gland cell was also observed in this study. The results showed that the growth and development of tested larvae was impeded and their life cycle was prolonged in both strains. It was also found that dimehypo was extremely harmful to the cocooning of B mori. Ultrastructural evidence suggests that adverse effects of dimehypo arise as a result of changes in the biosynthesis of fibroin and in the physiological activity of the posterior silk gland cell. The maximum acceptable daily dose of dimehypo based on growth and cocooning of B mori is less than 1.7 × 10−6 µg day−1 in spring-reared larvae and less than 1.7 × 10−8 µg day−1 in autumn-reared larvae. © 1999 Society of Chemical Industry