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Laboratory evaluation of resistance to pesticides in the phytoseiid predator Typhlodromus pyri from English apple orchards
Author(s) -
KAPETANAKIS E. G.,
CRANHAM J. E.
Publication year - 1983
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1983.tb02776.x
Subject(s) - carbaryl , biology , permethrin , orchard , horticulture , parathion methyl , pesticide , botany , predator , carbamate , toxicology , agronomy , predation , ecology , biochemistry
SUMMARY Typhlodromus pyri , reared on plate cultures and fed on pollen of Vicia faba , were bioassayed using a taped‐slide technique. Mite stocks from isolated unsprayed orchards were used to establish base‐line susceptibility to azinphos‐methyl, parathion, carbaryl and permethrin. Stocks from English orchards with a spray history of organophosphates and carbaryl showed resistance of 4 to 6x to azinphos‐methyl, c 50 x to parathion, >20x to carbaryl, and no resistance to permethrin. An orchard population derived from T. pyri imported from New Zealand in 1977 responded similarly. In other tests, mites exposed to spray residues on glass and on apple leaves were killed by lower concentrations than in taped‐slide tests (glass < apple leaf < taped‐slide technique); but for all three assay techniques the resistance factors to azinophos‐methyl and carbaryl, comparing two stocks, were similar. All stocks from sprayed orchards were resistant to both azinphos‐methyl and carbaryl, suggesting cross‐resistance; and resistance to both these pesticides appeared to be stable in the field when selection pressure was relaxed. The results are discussed in relation to earlier work on T. pyri and two other resistant orchard‐inhabiting phytoseiid species.