小菜蛾对阿维菌素的敏感度及抗性现实遗传力的分析

不同地区小菜蛾对阿维菌素的敏感度及其抗性现实遗传力的研究结果表明,宣化种群和武汉种群对阿维菌素的LC50仅是敏感品系的3郾7、5郾7倍,未产生明显抗性;北京种群和云南种群LC50分别是敏感品系的15郾7、22郾3倍。阿维菌素对小菜蛾抗性选育的21代和27代,分别估算抗性现实遗传力为0郾12。假设田间种群的抗性现实遗传力为室内选育估算值的50%,AVMs对小菜蛾的杀死率分别为50%、70%、80%和90%,则预计抗性增长到10倍时,AVMs可使用的次数分别为17次、12次、10次和8次。

Analysis on symptomatic heritability of Plutella xylostella's resistance to abamectin

Symptomatic heritabilities of diamond back moth (Plutella xylostella's) resistances to abamectin from different areas were studied. Results showed that LC50 of Xuanhua population and Wuhan population to abamectin were 3.7 and 5.7 times that of susceptible population respectively; LC50 of Beijing population and Yunnan population were 15.7, 22.3 times that of susceptible population. Symptomatic heritabilities of diamond back moth's resistances were about 0.12 after 21 and 27 generations of breeding. Assuming symptomatic heritabilities of field population were half that of indoor populations, mortalities of abamection to Plutella xylostella were 50%, 70%, 80%, 90%. AVMs applicable times of abamection should be 17, 12, 10 and 8 respectively provided diamond back moth's resistances increase 10 times.