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Resistance to binapacryl and tetradifon and the genetic background in fruit tree red spider mite panonychus ulmi from english apple orchards



Resistance to binapacryl and tetradifon and the genetic background in fruit tree red spider mite panonychus ulmi from english apple orchards



Annals of Applied Biology 100(1): 25-38



Assays on eggs of P. ulmi held on leaf disks of Myrobalan plum were used to characterize strains multi-resistant to organophosphates (OP) and binapacryl (strain BR), multi-resistant to OP and tetradifon (strain TR) and susceptible to OP, binapacryl and tetradifon (strain EM). By crosses of EM females and BR males, and of EM females and TR males, and by repeated backcrossing with EM males under selection pressure of the acaricides concerned, 2 strains were produced in which the specific genes for resistance to binapacryl and tetradifon were isolated in the genome of the EM strain. Reciprocal crosses of the resulting backcrossed strains with EM, assays on the F1 eggs and the F2 haploid eggs, confirmed the presence of single major genes for resistance to binapacryl and tetradifon, and the absence of maternal effects. The expression of gene BR was incompletely dominant in response to binapacryl, while gene TR was effectively dominant in response to tetradifon. Eggs of the field-derived strain BR showed .apprx. 50 times resistance to binapacryl, 8-19 times to dinobuton, but only .apprx. 2 times to dinocap and dinoseb. The backcrossed strain was less resistant (26 times) to binapacryl, implying that resistance in strain BR was augmented by the effects of minor genes. Resistance to tetradifon (150-200 times on eggs) involved cross-resistance to tetrasul (23 times) and to chlorfensulfide (27 times); resistance in the field-derived strain appeared to depend on the major gene alone. Resistance mechanisms were highly specific in their effects, so that there was no cross-resistance to unrelated acaricides, including amitraz, dicofol, cyhexatin, formetanate, chlordimeform and quinomethionate. Fecundity of strain BR was 44% less than that of EM; laboratory and field evidence suggest that multi-resistant mites tend to be less fit than susceptible mites. The practical implications are discussed.

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Accession: 006321204

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DOI: 10.1111/j.1744-7348.1982.tb07188.x


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