球孢白僵菌与苦参碱混配对烟粉虱的毒力与田间防效

Virulence and Field Control Effect of Beauveria bassiana Mixed with Matrine against Bemisia tabaci

旨在探讨球孢白僵菌与8种杀虫剂的相容性以及球孢白僵菌与苦参碱混配对温室烟粉虱的防治效果。首先进行8种杀虫剂与球孢白僵菌的相容性试验,然后选择相容性较高的苦参碱与球孢白僵菌的LC50浓度以9∶1、4∶1、1∶1、1∶4和1∶9体积比进行混配,以共毒系数对其毒力进行评价。结果表明:苦参碱与球孢白僵菌的相容性最好,尤其在10倍稀释度下,苦参碱对球孢白僵菌孢子萌发、菌丝生长及产孢抑制率分别为14.44%、10.17%和12.63%。苦参碱与球孢白僵菌体积比为4∶1时,共毒系数为293,增效作用最明显。综上所述,苦参碱与球孢白僵菌在LC50浓度下以4∶1体积比混配具有极显著的增效作用。

This article is to explore the compatibility of Beauveria bassiana with eight insecticides and the control effect of B.bassiana with matrine for Bemisia tabaci,and provides a reference for integrated control of B.tabaci in the greenhouse.Firstly,the compatibility test of eight pesticides with B.bassiana was conducted.In the concrete mixing process,blending proportions between matrine and B.bassiana of LC 50 are 9∶1,4∶1,1∶1,1∶4 and 1∶9,and its virulence was assessed by the co-toxicity co-efficient.The results showed that the matrine had the highest compatibility with strains.After being diluted 1∶10,the inhibition rate of spore germination,mycelial growth and sporulation of B.bassiana were 14.44%,10.17%and 12.63%,respectively.The highest co-toxicity co-efficient was 293 inmatrine mixed with B.bassiana in the proportion of 4∶1.In summary,matrine and B.bassiana mixed in the ratio of 4∶1 at the concentration of LC 50 had a significant synergistic effect.