Realized resistance heritability and resistance risk of Spodoptera exigua tocyhalothrin,fenvalerate and alpha-cypermethrin
在室内抗性选育的基础上，应用数量遗传学中的域性状分析法，分别研究了甜菜夜蛾(Spodoptera exigua)对三氟氯氰菊酯、氰戊菊酯和顺式氯氰菊酯3种拟除虫菊酯类杀虫剂的抗性现实遗传力(h2)，并对3种药剂在不同杀死率下的抗性发展速率进行了预测.结果表明，用三氟氯氰菊酯、氰戊菊酯、顺式氯氰菊酯分别连续汰选12、10和10代后，甜菜夜蛾对3种药剂的抗性分别提高了18.1、27.6和45.4倍，抗性现实遗传力分别为0.2567、0.3571和0.4239.假设遗传力为实验室汰选估算值的一半、药剂杀死率为50%～90%、预计抗性增长10倍时，三氟氯氰菊酯需要约9～20代，氰戊菊酯需要约6～14代，顺式氯氰菊酯需要约5～12代.甜菜夜蛾对以上3种拟除虫菊酯类杀虫剂均存在抗性风险.相比之下，顺式氯氰菊酯和氰戊菊酯的抗性风险大于三氟氯氰菊酯.
In this paper,Spodoptera exigua from Fuzhou of Fujian Province was continuously selected and bred to test its resistance to cyhalothrin，fenvalerate and alpha-cypermethrin,and to evaluate its realized resistance heritability (h2) and resistance risk.The results showed that after 12,10,and 10 generations,the resistance of S.exigua to cyhalothrin,fenvalerate and alpha-cypermethrin was increased by 18.1,27.6,and 45.4 fold,and the realized resistance heritability was 0.2567,0.3571 and 0.4239,respectively.Assuming that the h2 of field S.exigua population was half of these values,it required 9～20 generations for cyhalothrin,6～14 generations for fenvalerate,and 5～12 generations for alpha-cypermethrin to obtain 10-fold increase in resistance under selective pressure of 50%～90% mortality for each selective generation.Of the three pyrethroids,the resistance risk to cyhalothrin was smaller than that to fenvalerate and alpha-cypermethrin.
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