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Resistance levels ofTyphlodromus occidentalis (Acari: Phytoseiidae) from Washington apple orchards to ten pesticides

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Abstract

Nine Washington populations ofTyphlodromus (=Metaseiulus) occidentalis Nesbitt collected from commercial apple orchards were surveyed for resistance to ten pesticides. A susceptible population collected from wild blackberry which had no history of pesticide exposure was used in estimating resistance development. All populations from apple orchards were tolerant to high concentrations of azinphosmethyl, diazinon, endosulfan and propargite. Resistance was also apparent to these materials, especially for azinphosmethyl which produced over 100-fold resistance levels for several populations. Moderate to low levels of tolerance and resistance development were seen to field concentrations of cyhexatin, formetanate and carbaryl. Fenvalerate, methomyl and methidathion were all very toxic at field concentrations and little evidence of resistance development was apparent. The use of fenvalerate, methomyl or methidathion at a time whenT. occidentalis is active would likely abrogate favorable biological control of pestiferous orchard mites.

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Authors and Affiliations

  1. Department of Entomology, College of Agriculture and Home Economics, Washington State University, 99164-6432, Pullman, WA, (U.S.A.)

    J. M. Babcock & L. K. Tanigoshi

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  1. J. M. Babcock
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  2. L. K. Tanigoshi
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Scientific Paper No. 7502

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Babcock, J.M., Tanigoshi, L.K. Resistance levels ofTyphlodromus occidentalis (Acari: Phytoseiidae) from Washington apple orchards to ten pesticides. Exp Appl Acarol 4, 151–157 (1988). https://doi.org/10.1007/BF01193872

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  • DOI: https://doi.org/10.1007/BF01193872

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