Abstract: Six kinds of insect icides and three kinds of fungicides at convent ional field use concentrations were measured to determine the effects on mycelial growth of B. bassiana. In terms of the result, four kinds of insecticides with more compatiblity were picked out, that is Jiaweiyan, Chujin,Tieshazhang and Kangfu.Then, the four insecticides at 1/ 5 and 1/ 10 conventional field use concentrations were mixed with the suspension of B. bassiana at concentration of 1×10⁷ spores/mL respectively to study the effects of the mixture aginst Spodoptera exigua. As a consequence, the mixture containing insecticides at low concentrat ion were less effective than that at high concentration. Two days after treatment, thecontrolling effects of the mixture containing Jiaweiyan and Chujin increased to 53% - 70%. Ten days after treatment, thecontrolling effects were up to over 92%, and the controlling effects of the two kinds of mixture containing Jiaweiyan bothincreased to 97.7%. In the mixture, the pesticide was the key factor of high controlling effects, while B. bassiana wascritical to persistent controlling effects. Therefore, the mixture involved B. bassiana and Jiaweiyan or Chujin at low concentrat ion should be electded in order to get high and persistent controlling effects.

Key words: Beauveria bassiana, Chemical insecticide, Biotic compatibility, Controlling effect

CLC Number: 

• S433.4