Dosage Applied and Concentration Obtained in the Fumigation of Various Commodities with Methyl Bromide1

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Results are given of the sorption of methyl bromide by 15 different commodities at three different moisture contents fumigated under intermittent recirculation. The CL-50 was obtained by noting the time required for a concentration loss of 50% of the dosage applied for each commodity. The c. t. (concentration-time factor) was determined by calculating the mean average concentration in mg./l.X time in hours. The rate of sorption of methyl bromide by commodities such as barley, rice, and whole kernel wheat was much less in comparison with commodities such as flax and milo. Correlated mortalities of adult Tribolium confusum Jacquelin duVal and Sitophilus oryzae (L.) are given. Under the conditions of these experiments complete mortality of T. confusum adults could be expected regardless of commodity present if c.t. was greater than 75, or if the concentration remained above 50% of the dosage applied for more than 4 hours (CL-50= >4 hrs.). Similarly complete mortality of S. oryzae adults could be expected if c.t. was greater than 31 or if the CL-50 was>2.5 hours.

Document Type: Research Article

Publication date: October 1, 1962

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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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