Abstract

A strain of A. obtectus was selected for eight generations for resistance to lavender essential oil vapour. Selection resulted in 8.6 and 4.7 times more tolerant females and males, respectively. The synergists piperonyl butoxide, diethylmaleate and triphenyl phosphate were used to gain preliminary information on the possible mechanisms of resistance. The results from synergism tests suggested that the cytochrome P450 microsomal monooxygenases and the glutathione S-transferases are involved in the observed resistance. The hypothesis of development of resistance in eggs and larvae after adult selection was also tested, but no supporting results were found.

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