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Toxicity of Methyl Bromide and Phosphine at Various Temperatures and Exposure Periods to the Metamorphic Stages of Lasioderma serricorne

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Methyl bromide and phosphine were evaluated at various temperatures and exposure periods against the egg, larval. prepupal, pupal, and adult stages of the cigarette beetle. In general, as the temperature increased, the amount of methyl bromide or phosphine required for LD60 or LD95 decreased.

As the temperature increased from 4.4–10.0°C, and from 10.0–15.6°C. effectiveness of methyl bromide increased, but there was little difference as the temperature increased from 15.6–21.1°C. At 4.4 and 10.0°C, the 5-, 4-, and 3-day-old cocoons, which were predominantly pupae or prepupae, were the most tolerant stage to methyl bromide. At 15.6 and 21.1°C, there was a reversal in which the one-day-old cocoons, which were 100% larvae, were the most tolerant stage to methyl bromide.

At all temperatures tested (4.4, 10.0, 15.6, and 21.1°C) the 144-h exposure to phosphine was more effective than the 72 h for all stages. The eggs (0–24 h old) were more tolerant to phosphine than the other stages regardless of temperature or exposure period. There was little difference among larvae, stages within the cocoon, or adults in susceptibility to phosphine.

Document Type: Research Article

Publication date: August 1, 1977

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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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