【摘要】 采用浸叶法测定了嗜线虫致病杆菌Xenorhabdus nematophila HB310(Xn HB310)与7种常用杀虫剂混配后对小菜蛾3龄幼虫的毒杀增效作用,并对具有增效作用的混配组合进行了最佳配比的筛选和增效作用的评价。结果显示,Xn HB310仅与氯氰菊酯混配表现出明显的增效作用,协同毒力指数(cf)为30.9;当Xn HB310与氯氰菊酯质量比在1006.4∶2.6～816∶4之间时,混配药剂均表现为增效作用;当两种药剂的质量比为952∶3时,增效作用最强,此时的共毒系数最高为335。Xn HB310与乐斯本、吡虫啉或甲氨基阿维菌素苯甲酸盐(甲维盐)混配均表现为相加作用,cf值分别为9.6、-6.9和-18.6,Xn HB310与菜喜、灭幼脲或阿维菌素混配则表现出明显的拮抗作用,cf值分别为-48.4、-24.9和-57.1。更多还原

【Abstract】 In this paper,we determined the synergism of Xenorhabdus nematophila HB310(Xn HB310) mixed respectively with seven different kinds of insecticides on 3rd instar larvae of Plutella xylostella (L.) by method of leaf dipping in laboratory and evaluated the synergistic effect.The results showed that the mixture of Xn HB310 with cypermethrin had remarkable synergistic effect and the cooperative virulence index was 30.9.When the mix-proportion(w/w) of Xn HB310 with cypermethrin ranged from 1006.4:2.6 to 816:4,the mixtures showed synergistic effect and the mix-proportion of 952:3 had the highest co-toxicity coefficient(CTC,335).When Xn HB310 was mixed with dursban,imidacloprid or emamectin benzoate,it showed additive effect.The cooperative virulence indexes of the three mixtures were 9.6,6.9 and-18.6,respectively.On the contrary,when Xn HB310 was mixed with spinosad,chlorbenzuron or abamectin,the mixtures all showed antagonistic action and the values of each cooperative virulence indexes were-48.4,-24.9,-57.1,respectively.更多还原