几种复合微生物杀虫剂对刚竹毒蛾的药效试验

A Prelimilnary Study on Compound Microbial lnsecticides of Pantana phyllostachysae Chao

应用 3种白僵菌菌株、苏云金杆菌分别对 2～ 3龄刚竹毒蛾幼虫进行毒力测定 ,结果表明 ,4种生物制剂的毒力效果由高到低分别为白僵菌松毛虫菌株 (永安 ) >苏云金杆菌 >白僵菌刚竹毒蛾菌株 (邵武 ) >白僵菌松毛虫菌株 (邵武 )。应用白僵菌 +苏云金杆菌 +低浓度的80 %敌敌畏复合杀虫剂对刚竹毒蛾 2～ 3龄及 5～ 6龄幼虫进行正交试验 ,结果表明 ,复合杀虫剂的效果均高于单一生物制剂 ,其最佳组合为白僵菌松毛虫菌株 (永安 )孢子浓度为 1 2× 1 0 8个 /mL +苏云金杆菌 1 2× 1 0 8个 /mL + 80 %敌敌畏 1 /30 0 0 0 ,防治低龄幼虫。以及苏云金杆菌6× 1 0 8个 /mL + 80 %敌敌畏 1 /50 0 0 +白僵菌刚竹毒蛾菌株 1 2× 1 0 8个 /mL 。

We have tested the poisonous power to Pantana phyllostachysae of three different kinds of Beauveria bassiana,Bacillus thuringensis and 80% DDVP,against 2～3 instars larvae.The results showed,the sequence of poisonous power is Bb Dendrolimus (made in Yongan)>Bt>Bb P.phyllostachysae (Shaowu).Bised on the biological measure in laboratory and experment in field,the sptimum composition of compound micribial insecticides of P.phyllostachysae is chose,which are Bb Dendrolimus 1.2×10 8 spore/mL+Bt 1.2×10 8 spore/mL+80% DDVP 1/30 000 against 2～3rd instars larvae and Bt 6×10 8 spore/mL+Bb P.phyllostachysae 1.2×10 8 spore/mL+80% DDVP 1/5 000 to 4～6th instars larvae.