Abstract
The paper reports on the disruptive selection performed on two-spotted spider mite females in 20 inbred generations for resistance or sensitivity to four insectoacaricides belonging to different chemical groups: dimethoate, bifenthrin, abamectin, and bromopropylate. Due to the haplodiploid reproduction mode in mites, on average about 30% of nonresistant females were present in each generation of genotype differentiation in all acaricide-resistant lines. In single females from the lines under comparison, the electrophoretic separation of the enzymes revealed the presence of carboxylesterase fractions. Mites were tested with diagnostic concentrations of dimethoate, bifenthrin, and piridaben. The synergistic effects of the monooxygenase inhibitor piperonyl butoxide on mites were compared. It was concluded that the induction of carboxylesterase and monooxygenase activities is a universal adaptive response of the arthropod organism that underlies resistance to all acutely toxic insectoacaricides.
Published Version
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