Laboratory selection and inheritance mode of resistance to spinosad in the western flower thrips，Frankliniella occidentalis
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Key Words： Frankliniella occidentalis，spinosad， laboratory selection， resistance inheritance
Abstract： The response of western flower thrips, Frankliniella occidentalis （Pergande）, to selection for resistance to spinosad under laboratory conditions, and the mode of inheritance of spinosad resistance was investigated.After more than 2 years of selection resistance to spinosad in the selected strain increased 30-fold compared to the original strain, and 8.8-fold compared to the susceptible strain.The progeny of reciprocal F1 crosses (resistant male×susceptible female and resistant female×susceptible male) responded similarly in bioassays, with values of 0.51 and 0.42 for D（degree of dominance）, respectively, indicating that resistance was autosomal and incompletely dominant.Analysis of dose-response lines indicates that there were no plateaus at 50% mortality of backcross progeny (F1×susceptible strain) and at 25% and 75% mortalities of self-cross of backcross progeny.Chi-square analysis of the resistance of progeny from backcrosses (F1×susceptible strain) and self-cross of backcrosses suggest that resistance to spinosad is probably controlled by several genes.