《环境昆虫学报》

作者	单位
谢梅琼，王龙江，韩永强，杨峥	1. 宜春学院生命科学与资源环境学院/江西省作物生长发育调控重点实验室，江西宜春 336000；2. 宜春学院化学与生物工程学院，江西宜春 336000

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中文摘要:

为了明确玫烟色棒束孢Isaria fumosoroseus与常用农药的相容性，本研究测定了7种常用农药制剂对玫烟色棒束孢菌丝生长、孢子萌发以及产孢量的影响，测试了相容性较好杀虫剂与玫烟色棒束孢混用对小菜蛾Plutella xylostella Linnaeus的防治效果。结果表明，田间使用浓度下，氯虫苯甲酰胺、双丙环虫酯和四氯虫酰胺对菌丝抑制作用相对较小，田间浓度和亚致死浓度的阿维菌素对菌丝生长具有促进作用。所有供试农药在田间使用浓度下对孢子萌发均具有明显抑制作用，抑制作用随农药浓度降低而减弱，其中噻虫啉和四氯虫酰胺对孢子萌发抑制作用相对较小。所有测试药剂对产孢量具有显著抑制作用，抑制作用随农药浓度降低而减弱，其中噻虫啉和氯虫苯甲酰胺抑制作用较小。玫烟色棒束孢3种浓度（9×107、9×106、9×105个孢子/mL）分别与次亚致死剂量四氯虫酰胺混用对小菜蛾的LT50分别为2.19 d、2.94 d、5.16 d，杀虫速度高于单用相应浓度真菌处理（2.34 d、3.29 d、5.33 d）和四氯虫酰胺单独处理（10.60 d）。综合分析结果表明，低剂量的四氯虫酰胺、噻虫啉和氯虫苯甲酰胺与玫烟色棒束孢相容性相对较好，是田间菌药混用可供选择对象；次亚致死剂量的四氯虫酰胺与真菌混用防控小菜蛾具有协同增效作用。

英文摘要:

In order to determine the compatibility of Isaria fumosorosea with common pesticides, the effects of seven pesticides on mycelia growth, conidia germination and sporulation of I. fumosorosea were determined, and the synergistic effects of insecticides with good compatibility mixed with I. fumosorosea against Plutella xylostella were determined. The results indicated that all pesticides showed different effects on mycelia growth under conventional concentration, and the inhibition of chlorantraniliprole, afidopyropen and tetrachlorantraniliprole was significantly reduced compared with other pesticides, while avermectin even promoted mycelia growth at the conventional and sublethal concentration. All pesticides significantly inhibited conidia germination at conventional concentration and the inhibition declined as the concentration decreased, and the inhibitory effect on conidia germination of thiacloprid and tetrachlorantraniliprole were significantly reduced. All pesticides inhibited sporulation extremely under conventional concentration, among which the inhibition of thiacloprid and chlorantraniliprole showed less inhibitory effect. The combination used of low dose of tetrachlorantraniliprole and different concentrations of I. fumosorosea showed different effect on the control of P. xylostella. The LT50 of mixture suspensions of low sub-lethal dose of tetrachlorantraniliprole with different concentrations of I. fumosorosea (9.0×107, 9.0×106, 9.0×105 conidia/mL) against P. xylostella were 2.19 d, 2.94 d and 5.16 d, respectively, which was shorter than those of the I. fumosorosea suspensions (2.34 d、3.29 d、5.33 d) and the treatment of low sub-lethal dose of tetrachlorantraniliprole (10.60 days）. In conclusion, chlorantraniliprole, thiacloprid and tetrachlorantraniliprole showed a comparatively higher compatibility with I. fumosorosea at the low-dose concentration, which could be selected as candidates for the mixed use with fungus. The combination used of low sub-lethal dose of tetrachlorantraniliprole and different concentrations of I. fumosorosea showed synergistic effect on the control of P. xylostella.

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