Study on Control of Bettle Larvae by Mixture of Pesticides with Beauveria brongniartii

Bioassay of different concentrations of Beauveriabrongniartii(NEAU30503) spore suspension on white grub was detected,choosing formulaic Beauveria brongniartii and Green b.bassianaas control,and the mortality rate of Beauveria brongniartii with 2kinds of chemical pesticides(Ceramic bens creme and kungfu creme) were also detected.The results of toxicity determination in laboratory showed that Beauveria brongniartii(NEAU30503) at the dose of 1.25×10 11 conidia / L was highly correct mortality as 79.9%.The correct mortality of the reference treament was from 37.4%to 59.9%.While the mixtures of the insecticides with Beauveria brongniartii,the control effect of the mixtures of Dursban(1 000×) with Beauveria brongniartii showed the highest virulence whose LT 50 of the larvae was 2.1d,and LT 90 was 4.9d.