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Baseline Responses to Phosphine and Resistance Status of Stored-Grain Beetle Pests in Queensland, Australia

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Laboratory strains and field populations of Rhyzopertha dominica (F.), Sitophilus Oryzae (L.), Oryzaephilus surinamensis (L.), and Tribolium castaneum (Herbst) from Queensland, Australia, were tested with a range of concentrations of phosphine. Based on these tests, concentrations that could be used with a 20-h exposure to discriminate between susceptible and resistant individuals for the four species were (mg/liter) 0.03, 0.04, 0.04, and 0.03. Other concentrations were needed to discriminate between detected resistance and possible higher level resistance. Discriminating concentration tests showed that resistance to phosphine was common in field populations of R. dominica and S. oryzae, but not in O. surinamensis or T. castaneum. Resistance factors based on 20-h exposures of selected resistant strains were 20 times for R. dominica, four times for S. oryzae, and three times for O. suTinamensis.

Document Type: Research Article

Publication date: October 1, 1990

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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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