【摘要】 为明确增效剂对防治小菜蛾的杀虫剂的增效作用,减少化学农药用量,分别采用浸叶法和茎叶喷雾法进行了室内毒力测定和田间药效试验。室内测定结果表明,3种供试杀虫剂中,虫螨腈和乙基多杀菌素对小菜蛾毒力较强,其LC₅₀分别为6.303 mg/L和10.479 mg/L;3种杀虫剂分别与不同增效剂混配后均具有一定的增效作用,增效比介于1.6～5.1,其中高效氯氰菊酯+橙皮精油、虫螨腈+激健和乙基多杀菌素+有机硅的组合增效作用明显。田间试验表明,在保证防效的前提下,通过添加激健可使10%虫螨腈SC使用量减少20%,添加有机硅可使60 g/L乙基多杀菌素SC使用量减少50%。因此,激健、有机硅可作为防治蔬菜小菜蛾杀虫剂的理想增效剂产品,在生产中推广应用。更多还原

【Abstract】 In order to determine the synergisms of four synergists to three pesticides for the control of Plutella xylostella and reduce the application of chemical insecticide, indoor bioassays and field efficacy trials were tested by leaf dipping method and stem spraying method, respectively. Result of toxicity showed that the LC₅₀ values of chlorfenapyr and spinetoram were 6.303 mg/L and 10.479 mg/L, respectively. The four synergists can increase the toxicity of three insecticides, and the synergistic ratios ranged between 1.6-5.1. Among them, beta-cypermethrin+orange peel oil, chlorfenapyr+Jijian and spinetoram+organic silicon had the best synergistic effect. Field experiments showed that the preparation dosage of chlorfenapyr 10% SC and spinetoram 60 g/L SC decreased by 20% and 50% after adding Jijian and organic silicon, respectively. Therefore, Jijian and organic silicon have good application potential in the chemical control of P.xylostella.更多还原