几种药剂防治龙眼木毒蛾效果试验

应用白僵菌Bbm3、Bbta菌株和本地区农民常用的化学农药80%敌敌畏EC、2.5%敌杀死EC对木毒蛾幼虫进行室内毒力测定和林间防治试验。结果表明:木毒蛾对敌敌畏不敏感,药效下降,产生抗药性;敌杀死虽有较好效果,但污染环境,残留大,不宜大量使用;白僵菌Bbm3尽管初期见效慢,但10~15 d防效达95%以上,效果好,属无公害农药。从经济和生态两方面考虑以Bbm3菌株应用较好,而且持效期长,防效高,可以在生产上大面积推广应用。

Effectiveness Tests on several pesticides Against Lymantria xylina in the Dimocarpus longan Lour

Toxicities of Beauveria bassiana strain Bbm3,Bbta and several chemical pesticides,such as 80%dichlorvos EC,2.5%Decis EC on Lymantria xylina Drury were tested both in laboratory and field conditions.The results showed that L.xylina was insensitive to dichlorvos which indicated that resistance had occurred.2.5%Decis had better control effect,but it was not the optimal choices for the risk of pollution and residue.Although B.bassiana Bbm3 strain worked a little slowly,10～15 days after treatment,the effect was more than 95%,too.moreover,it did not have the risk of pollution or residue.The Bbm3 strain can be generalized on practice for its long period of validity and high effect.