Organophosphorus Resistance in An Apple Orchard Population of Typblodromus (Amblyseius) fallacis1,2

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Results of a survey of the mite fauna found in a commercial apple orchard in Wilkes Co., North Carolina, indicated that populations of a phytoseiid, Typhlodro1n!ls (Amblyseius) fal/acis (Garman), and a stigmaeid, Zet- Zellia mali (Ewing), were surviving azinphosmethyl applications. A strain of T. fallacies which had shown resist- ance in the field to azinphosmethyl was subjected to laboratory toxicity tests, and the results showed a high to moderate degree of resistance to azinphosmethyl and parathion when compared with a susceptible strain. The organophosphorus-resistant strain showed no resistance to carbaryl.

Document Type: Research Article

Publication date: October 1, 1970

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