Selection of the Western Predatory Mite, Metaseiulus occidentalis (Acari: Phytoseiidae), for Resistance to Abamectin

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Abstract
A heterogeneous colony of Metaseiulus occidentalis (Nesbitt) was selected 20 times with increasing concentrations of abamectin. Selection yielded a gradual and modest shift in concentration-mortality lines. The resistance obtained, a 3.8-fold increase at LC50 not only resulted in an increased rate of survival of adult females but resulted in an increase in the number of eggs the surviving females produced. The diversity of resistances in this predator (to organophosphates, carbamates, pyrethroids, sulfur, and abamectin) iscomparable with that of many pest arthropods. Availability of an abamectin-resistant strain could be of practical value in integrated pest management programs if the resistant strain is released, established, and is efficacious in deciduous orchards and vineyards.

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