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Pyrethroid Resistance in Heliothis armiger (Hübner) (Lepidoptera: Noctuidae) in Australia

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Data are presented for permethrin, fenvalerate, cypermethrin, and deltamethrin tested against laboratory-reared third-instar Heliothis armiger (Hübner) collected m Australia from 1977 to 1983. There was no evidence of resistance until January 1983 when a strain was submitted from cotton at Emerald, central Queensland, where pyrethroids had failed to give adequate control of H. armiger. Initial tests indicated that ca. 50%of the strain was resistant. Survivors of discriminating concentrations of cypermethrin, deltamethrin, and fenvalerate were retained to give a selected strain which was 15-fold, 20- to 30- fold, and 20-fold resistant, respectively, to these chemicals at the LC50. Selection at twice these concentrations gave a strain which was 50-fold resistant to fenvalerate. Resistance to permethrin another unselected field strain was ca. 10-fold. Forty-three strains of H. armiger were tested with a discriminating concentration of fenvalerate in 1983; resistant individuals were. Identified 17 of these. All five strains from Emerald contained a high proportion of resistant individuals. The results indicated a low overall frequency of resistant idividuals in the remammg cotton-growing areas in Queensland and New South Wales.

Document Type: Research Article

Publication date: October 1, 1984

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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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