Effect of the Mixture of Common Pesticides with Beauveria tenella Against Spodoptera exigua

The effects of 6 insecticides and 3 fungicides on the mycelial growth of B.tenella were investigated.Based on the rusult,four kinds of insecticides including Jiaweiyan,Chujin,Tieshazhang and Kangfu were proved to be more compatible with B.tenella than others.The mixtures of the 1/5 or 1/10 conventional of the 4 insecticides respectively with the suspension of B.tenella at the concentration of 1×107spores/mL were tasted against Spodoptera exigua.The result indicated that the virtue of the mixture at 1/5 deadly concentration had better effective than that at 1/10.Besides,the former had a higher defensive effect than the latter.Two days after treatment,the controlling effect of the mixture containing Jia weiyan and Chujin at 1/5 deadly concentration increase to 59.9% and 90.7%,while the mixture at 1/10 deadly concentration increase to 49.9%~67.8%.Ten days after treatment,the former controlling effect was up to 97%,while the latter to 95%.