朱砂叶螨对两种杀螨剂的抗性遗传力及风险评估

Realized heritabilities of resistance to fenpropathrin and abamectin in Tetranychus cinnabarinus (Boiduval)

在室内抗性培育的基础上,应用数量遗传学中的域性状分析法研究了朱砂叶螨对甲氰菊酯和阿维菌素两种杀螨剂的抗性现实遗传力,并对两种药剂在不同杀死率下,朱砂叶螨抗性发展的速率进行了预测。结果表明,用甲氰菊酯、阿维菌素分别连续汰选16、18代后,朱砂叶螨对两者的抗性分别为28.61和4.36倍,抗性现实遗传力分别为0.2685和0.1385。在室内选择条件下,杀死率为50％～90％时,要获得10倍抗性,甲氰菊酯需要约13～6代,阿维菌素需要约28～13代。生物源农药阿维菌素的抗性风险明显低于菊酯类药剂甲氰菊酯。试验结果为朱砂叶螨抗性治理提供了理论依据。

Threshold trait analysis was applied to estimate realized heritability ( h2) of resistance and resistance risk to 2 acaricides in Tetranychus cinnabarinus . The h2 of resistance to fenpropathrin and abamectin were 0.2685 and 0.1385 respectively. If the mortality in each generation was 50% -90% by 2 acaricides respectively, expected resistance increased to 10-fold 13-6 generations should be treated with fenpropathrin, and 28-13 generations for abamectin. Fenpropathrin has higher resistance risk than abamectin in Tetranychus cinnabarinus. These results could be applied to manage the pesticides resistance of Tetranychus cinnabarinus.