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吡杀灵是一种由吡虫啉与杀虫单组成的复配剂农药 ,对褐飞虱、白背飞虱、叶蝉、螟虫有较高的防效。本文对应用吡杀灵的稻田进行系统调查结果表明 :施用吡杀灵与甲胺磷的稻田害虫种类、寄生性和捕食性天敌种类有明显的差异。根据 Shannon- Wiener的多样性指数 H和均匀性指数 J等指标测定 ,吡杀灵防治区生物种群的多样性明显高于甲胺磷防治区 ,而甲胺磷防治区害虫多样性高于寄生性昆虫和蜘蛛类群。吡杀灵防治区稻田天敌多样性高于害虫。两种稻田的生物均匀度差异不大。根据各群落特征分析 ,应用吡杀灵的稻田生物群落内部结构比甲胺磷稳定 ,抗害能力和自我调节能力强。
Piracetam is a compound pesticide consisting of imidacloprid and insecticide, which has good control effects against brown planthopper, white-backed planthopper, leafhopper and stem borer. In this paper, the systematic investigation on the paddy field with Piracetam was carried out. The results showed that there were obvious differences in the types of pest insects, parasitic and predatory natural enemies. According to Shannon-Wiener’s index of diversity index H and evenness index J, the diversity of the biological population in the Xiashiling community was significantly higher than that of the methamidophos zone, while that of the methamidophos zone was higher than that of the parasitic Insects and spiders. The diversity of natural enemies in the paddy fields in the Xi’erling prevention and control area is higher than that of the pests. There was no significant difference in biological uniformity between the two paddy fields. According to the analysis of community characteristics, the internal structure of the paddy field biotic community applying Piracetam was more stable than Methamidophos, showing strong ability of resistance and self-regulation.