The Relation of Moisture Content and Temperature of Stored Grain to the Effectiveness of Grain Fumigants Under Forced Circulation1

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Results are given of the mortality of the adults of Tribolium confusum Duv. And Sitophilus oryza (L.) obtained when fumigated with carbon tetrachloride, hydrocyanic acid, and methyl bromide under forced circulation with no load, and in the presence of wheat and corn of 10%, 12.5%, and 15% moisture content and 50. 70, and 90. and the concentration of the fumigant under these conditions.

Under conditions of forced circulation the drop in concentration of carbon tetrachloride, hydrocyanic acid, and methyl bromide was greater in corn than in wheat, and the higher moisture contents of corn or wheat, these effects being reflected in insect mortality. The sorption of carbon tetrachloride by corn or wheat was greatest at 50. and least at 90., while temperature had little effect on the sorption of hydrocyanic acid or methyl bromide by corn or wheat.

Adults of Sitophilus Oriya were more tolerant to carbon tetrachloride, and hydro cyanic acid than adults of Tribalism confusebut the reverse was true for methyl bromide. The insects were more susceptible to the fumigants at the higher temperatures.

Document Type: Research Article

Publication date: December 1, 1960

More about this publication?
  • 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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