甲氰混剂对3种农业害虫的毒力及其增效机理研究(英文)

Toxicity and Synergistic Mechanism of Mixed Insecticide Jiaqing against Three Agricultural Pest Insects 

研究了甲基对硫磷、氰戊菊酯及其混剂 (1 0∶1 )对 3种重要农业害虫粘虫、豆蚜和稻黑尾叶蝉的毒力及其增效机理。生测结果表明 :甲基对硫磷与氰戊菊酯混配对粘虫、蚜虫和叶蝉表现出明显的增效作用 ,其共毒系数分别为 1 79.0 4、1 91 .1 2和 2 1 6.44;生化测定结果表明 ,在相同浓度下 ,甲氰混剂对粘虫活体乙酰胆碱酯酶 (AChE)活性的抑制率较单剂高 ,说明甲氰混剂对AchE抑制作用增强可能是其重要增效机制之一 ;根据药剂的毒力值 (LC90 )和价格所进行的应用指数评价结果表明 ,甲氰混剂的应用指数均高于单剂甲基对硫磷 。

Toxicities and synergistic mechanisms of parathion methyl, fenvalerate and their binary mixture Jiaqing (10∶1) were studied against oriental armyworm Mythimna separata Walker, black bean aphid Aphis fabae Scopoli and rice leafhopper Nephotettix cincticeps (Uhler). Bioassay results revealed that mixed insecticide Jiaqing exhibited a significant synergism against oriental armyworm, bean aphid and rice leafhopper, and its cotoxicity coefficient (CTC) was 179.04, 191.12 and 216.44 respectively. According to biochemical studies on in vivo inhibition of acetylcholinesterase in oriental armyworm, it appeared that the mixed insecticide Jiaqing had a stronger inhibitory effect on the target enzyme than parathion methyl and fenvalerate alone at the same concentration, indicating that increased inhibition to the acetylcholinesterase in the insect was one of the important synergistic factors of mixed parathion methyl and fenvalerate. Based on LC 90 value to three insects and price of the insecticides, application index analyses showed that the mixed insecticide Jiaqing had a greater application index to three pest insects than parathion methyl applied alone, suggesting the potential economic benefit and application value of the mixed insecticide Jiaqing in targeted pest management.