【摘要】 莲缢管蚜是危害泽泻生长的重要害虫之一。药效试验结果表明,2.5%菜喜SC、1.5%普乐CS、25%阿克泰WG、3%莫比朗EC和20%康福多EC对莲缢管蚜具有良好的防效,适宜在泽泻生产上使用。莲缢管蚜虫口数量与块茎产量损失率之间相关式:在生长前期,Y=-0.331 8+0.397 8X(r=0.993**);在生长中期,Y=0.041 2+0.247 4X(r=0.950*);在生长后期,Y=-0.003 6+0.113 9X(r=0.922*)。根据经济阈值的计算公式,结合莲缢管蚜虫口数量与块茎产量损失率之间的相关式,制定出了不同时期选用不同药剂的防治指标。更多还原

【Abstract】 Rhopalosiphum nymphaeae L is one of the important pests in Alisma orientale（Sam.） Juzep.The results of field trial for the pesticide efficacy showed that 2.5% Spinosad SC,1.5% Gamma-Cyhalothrin CS,25% Actara WG,3% Mospilan EC,20% Confidor EC had good effects on Rhopalosiphum nymphaeae L,useful in production of Alisma orientale（Sam.） Juzep.In addition,the relationship between the amount of Rhopalosiphum nymphaeae L and the yield loss rate of the tuber of Alisma orientale（Sam.） Juzep.was investigated,their relations fitted to the formula:Y=-0.331 8+0.397 8X(r=0.993^**),for earlier stage;Y=（0.041 2）+0.247 4X（r=0.950^*）,for later period;Y=-0.003 6+0.113 9X（r= 0.922^*）,at the later stage.According to the formula,the control indexes of differenf kinds of pesticides at different stages were finally determined.更多还原