2种用药方案对稻田主要天敌群落结构影响的差异

通过田间试验,观察并分析2种用药方案对稻田害虫天敌群落结构影响的差异。结果表明:噻嗪酮与氯虫苯甲酰胺混配(用药方案Ⅰ)后施用,田间害虫天敌的科数和虫数均多于吡虫啉与毒死蜱混配(用药方案Ⅱ)后施用的田块;用药方案Ⅰ处理的田间天敌群落香农指数和均匀性指数均显著高于用药方案Ⅱ处理的田块;用药方案Ⅰ处理田间捕食类天敌狼蛛科和肖蛸科的优势度显著高于用药方案Ⅱ处理和对照;用药方案Ⅰ处理田间茧蜂科和皿蛛科的优势度显著低于用药方案Ⅱ处理,说明以噻嗪酮与氯虫苯甲酰胺混配后防治稻飞虱和稻纵卷叶螟比用吡虫啉与毒死蜱混配防治对天敌更加安全。

Differential impact of two treatments on the main natural enemies community structure in rice fields

The impacts of two treatments on the natural enemy community diversity was evaluated through field test.The results showed that the number of family and population of natural enemies in the plots using buprofezin and chlorantraniliprole(treatment Ⅰ) was larger than that using imidacloprid and chlorpyrifos(treatment Ⅱ).The Shannon-Wiener diversity index and evenness index of the plots with treatment Ⅰ were significant higher than those with treatment Ⅱ.The relative dominance of Lycosidae and Tetragnathidae in the plots with treatment Ⅰ was significantly higher that with treatment Ⅱ and that in the control plots.The relative dominance of Braconidae and Linyphiidae was significantly lower with treatment Ⅰ than that with treatment Ⅱ.The results suggested that using buprofezin and chlorantraniliprole to control rice planthopper and Cnaphalocrocis medinalis will be safer than using imidacloprid and chlorpyrifos.