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1 June 2007 Genetics of Spinosad Resistance inFrankliniella occidentalis (Thysanoptera: Thripidae)
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Abstract

The genetic basis of spinosad resistance was investigated in the western flower thrips,Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae). The resistant strain, selected in the laboratory for spinosad resistance from a pool of thrips populations collected in Almeria (southeastern Spain), showed a very high resistance to spinosad (356,547-fold based on LC50 values) compared with the laboratory susceptible strain. Mortality data from reciprocal crosses of resistant and susceptible thrips indicated that resistance was autosomal and not influenced by maternal effects. Analysis of probit lines from the parental strains and reciprocal crosses showed that resistance was expressed as an almost completely recessive trait. To determine the number of genes involved, a direct test of monogenic inheritance based on the backcrosses suggested that resistance to spinosad was probably controlled by one locus. Another approach, which was based on phenotypic variances, showed that nE, or the minimum number of freely segregating genetic factors for the resistant strain, equaled 0.59.

P. Bielza, V. Quinto, E. Fernández, C. Grávalos, and J. Contreras "Genetics of Spinosad Resistance inFrankliniella occidentalis (Thysanoptera: Thripidae)," Journal of Economic Entomology 100(3), 916-920, (1 June 2007). https://doi.org/10.1603/0022-0493(2007)100[916:GOSRIF]2.0.CO;2
Received: 29 September 2006; Accepted: 1 February 2007; Published: 1 June 2007
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