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Monitoring Azinphosmethyl Resistance in the Light Brown Apple Moth (Lepidoptera: Tortricidae) in New Zealand

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Abstract:

The extent of azinphosmethyl resistance in light brown apple moth, Epiphyas Postvittana (Walker), in the Nelson region of New Zealand was determined in 1982. Light traps were used to capture females from which laboratory colonies were established for testing. Resistance was detected by spraying larvae directly with a Potter tower. In later resistance surveys (1983–85) topical application to pheromone-attracted males was used to assess resistance. Two populations (at Mariri and at the Moutere Bluffs) resistant to azinphosmethyl, but of confined distribution, were found. Resistant male moths were collected from apple orchards and nearby scrub areas and were more abundant outside orchards during the period of insecticide spray application. Subsequent reinvasion of orchards by moths from nearby scrub areas within the orchard area was indicated by the similarity in proportion of resistant individuals in the two habitats and by catches in pheromone-baited sticky traps from orchards and scrub areas. Two percent fruit damage occurred in an affected orchard in which the grower applied azinphosmethyl, compared with a normal level of ca. 0–0.2% damage elsewhere in the district.

Document Type: Research Article

Publication date: August 1, 1987

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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