Genetic analysis of resistance to azinphosmethyl in the pear psylla Cacopsylla pyri |
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Authors: | R Buè s, J.F. Toubon L. Boudinhon |
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Affiliation: | (1) Zoology Unit, INRA, F-84914 Avignon cedex 9, , France |
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Abstract: | Laboratory selection with azinphosmethyl had little effect on the chemical resistance in Cacopsylla pyri strains, in comparison to the original wild populations. The resistance ratio relative to a susceptible strain varied from 10- to 40-fold depending on the generation studied. Crosses between two resistant strains and the susceptible strain show resistance to be autosomally inherited and semi-dominant in expression. Backcrosses between F1 and the susceptible strain were unable to distinguish unabigously between monogenic and polygenic inheritance. In the majority of experiments, however, the overall dose-response relationship for backcross progeny was consistent with a single gene hypothesis. Additional bioassays showed azinphosmethyl-resistant strain to cross-resistant monocrotophos and phosmet, but not carbamates, pyrethroids, amitraz or the organophosphates chlorpyrifos and mevinphos. |
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Keywords: | Cacopsylla pyri insecticide resistance genetics cross-resistance |
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