Journal of Economic Entomology (1997) 90, 252-260

Lucia G. Varela, Peter W. Shearer, Vincent P. Jones, Helmut Riedl and Stephen C. Welter (1997)
Monitoring of insecticide resistance in Phyllonorycter mespilella (Lepidoptera: Gracillariidae) in four western states
Journal of Economic Entomology 90 (2), 252-260
Abstract: A 4-state regional survey was conducted to assay for insecticide susceptibility in Phyllonorycter mespilella (Hübner) to azinphosmethyl, oxamyl, and esfenvalerate. Levels of insecticide susceptibility were determined using a topical bioassay on male moths collected in the field with pheromone traps in California, Oregon, Utah, and Washington. Of the populations of adult male P. mespilella tested, all but the population of Saint Cloud, WA, were resistant to azinphosmethyl. All populations tested were susceptible to oxamyl. Approximately 15% of the individuals within the Santon population in California were resistant to esfenvalerate. An egg bioassay indicated that azinphosmethyl did not provide effective control at commercial application rates. In larval bioassays, oxamyl at 0.30 g (AI)/liter was shown to control 99% of the Saxton population, whereas no mortality was detected with azinphosmethyl or fenvalerate at commercial application rates.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Lucia G. Varela, Vincent P. Jones, Peter W. Shearer

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
pheromones/attractants/traps

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phyllonorycter mespilella		U.S.A. (NW)
	Phyllonorycter mespilella	Apple (Malus)	U.S.A. (SW)