两种拟青霉菌提取物对菜蚜的控制作用

Laboratory and field evaluation on insecticidal activity of the metabolites from two Paecilomyces spp. against aphids

浸叶法毒力测定结果表明,淡紫拟青霉(Paecilomyces lilacinus)菌株MCWA18和拟青霉(Paecilomycessp.)菌株X1甲醇萃取物对萝卜蚜无翅成蚜48 h后LC50分别为0.3435 mg/mL和0.8309 mg/mL。网室盆栽试验,菌株MCWA18和X1甲醇萃取物2.5 mg/mL处理7 d后对菜蚜的防治效果分别为92.24%和87.06%,田间小区试验处理后7 d,防治效果分别为81.82%和81.70%,相当于1.3%鱼藤氰乳油500倍的防效。

Studies of biological activity indicated that methanol partitions from the extracts of Paecilomyces lilacinus MCWA18 and Paecilomyces sp. X1 strain had high activity against wingless adult of Lipaphis erysimi and the values of LC50 were 0. 343 5 mg/mL and 0. 830 9 mg/mL by leaf-dipping treatment for 48 h, respectively. The results showed that both of the extracts from P. lilacinus MCWA18 and Paecilomyces sp. X1 could well control aphids by spraying at the concentration of 2. 5 mg/mL and the control efficacy was 92. 24% and 87. 06% in pot trials and 81. 82%, 81.70% in field trials after treatment for 7 d, respectively.