[Realized resistance heritability and resistance risk of spodoptera exigua to cyhalothrin, fenvalerate and alpha-cypermethrin].
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 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 to approximately 20 generations for cyhalothrin, 6 to approximately 14 generations for fenvalerate, and 5 to approximately12 generations for alpha-cypermethrin to obtain 10-fold increase in resistance under selective pressure of 50% to approximately 90 % mortality for each selective generation. Of the three pyrethroids, the resistance risk to cyhalothrin was smaller than that to fenvalerate and alpha-cypermethrin.
Lan
Yiquan
Y
College of Plant Protectionl, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Zhao
Shixi
S
Wu
Gang
G
D000818:Animals; D007305:Insecticide Resistance / Q000235:genetics*; D007306:Insecticides / Q000494:pharmacology; D007915:Lepidoptera / Q000235:genetics*; D009570:Nitriles / Q000494:pharmacology*; D011722:Pyrethrins / Q000494:pharmacology*; D018570:Risk Assessment
D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C017160:cypermethrin; C037304:cyhalothrin; C017690:fenvalerate