卵孢白僵菌与农药混用对蛴螬防治效果研究

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

使用不同浓度的卵孢白僵菌(NEAU30503)孢子悬浮液对蛴螬进行了生物测定,以商品卵孢白僵菌和绿僵菌作为对照,同时测定了卵孢白僵菌与陶本斯乳油和功夫乳油2种化学农药混用对蛴螬的致死率。结果表明:生物农药单独使用时,仅1.25×1011孢子数/L的卵孢白僵菌(NEAU30305)在40d时药效达到79.9%,对照处理的杀虫效果为44.6%～59.7%。菌药混用测定中,陶丝本(3 000×)与卵孢白僵菌的LT50仅为2.1d,LT90为4.1d,其防效最好。

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.