球孢白僵菌与三种农药对萝卜蚜的协同防治效果

发布时间：2018-05-08 12:05

本文选题：球孢白僵菌 + 萝卜蚜　；参考：《中国生物防治学报》2017年06期

【摘要】：前期选育得到了侵染蚜虫的球孢白僵菌高毒力菌株,但蚜虫发育繁殖快而白僵菌侵染致病慢的问题制约了该菌株的应用。为此,进行了白僵菌及吡虫啉、乐果、高效氯氰菊酯不同浓度单独处理,以及菌药混合处理对萝卜蚜的生物测定比较,结果表明,白僵菌浓度在0.08×106~50×10~6孢子/m L,可导致萝卜蚜47.0%~89.3%的死亡率。以2×10~6孢子/m L中等浓度白僵菌分别与1/10推荐浓度的吡虫啉、1/5推荐浓度的乐果和高效氯氰菊酯进行混用处理,可使萝卜蚜死亡率显著提高到97.3%~100%,LT50由76.8 h缩短到46.9~56.5 h。通过孢子萌发率检测表明球孢白僵菌与3种农药有较好的相容性。本试验证明白僵菌与3种农药具有良好协同增效作用,并确定了菌药混用的适宜浓度,为田间治蚜工作中制定减施化学农药、提高白僵菌防效策略提供科学依据。
[Abstract]:The high virulence strain of Beauveria bassiana infected aphid was obtained in the early stage, but the rapid development and reproduction of aphid and the slow infection and pathogenicity of Beauveria bassiana restricted the application of this strain. Therefore, the bioassay of different concentrations of Beauveria bassiana, imidacloprid, dimethoate and cypermethrin, as well as the mixed treatment of bacteria and drugs on aphid radish aphid was compared. The concentration of Beauveria bassiana was 0.08 脳 10 ~ (6) ~ 50 脳 10 ~ (6) spores / m ~ (-1), which resulted in a mortality rate of 89.3%. Treated with 2 脳 10 ~ 6 spore / mL medium concentration Beauveria bassiana and 1 / 10 recommended concentration of imidacloprid 1 / 5 dimethoate and cypermethrin respectively, the mortality of radish aphid was significantly increased from 76.8 h to 46.956.5 h. The results of spore germination showed that Beauveria bassiana had good compatibility with three pesticides. The experiment proved that Beauveria bassiana and three kinds of pesticides had good synergistic effect, and determined the suitable concentration of the mixed use of bacteria and drugs, which provided scientific basis for the formulation of reducing the application of chemical pesticides and improving the control effect strategy of Beauveria bassiana in the field.
【作者单位】：中国农业科学院植物保护研究所/植物病虫害生物学国家重点实验室;
【基金】：国家重点研发计划(2017YFD0201205) 中俄合作项目(2012DFR30810) 国家产业技术体系(CARS-35-07) 农业科技成果转化资金项目(2013GB23260581)
【分类号】：S433.39

【相似文献】