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Interaction of Gamma Radiation and Fumigation on Confused Flour Beetles1,2,3

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Adult Tribolium confusum Jacquelin duVal were treated with various combinations of gamma radiation and fumigants (methyl bromide or phosphine). Very low radiation dosages (2-6 had) usually reduced the effectiveness of methyl bromide fumigation when the radiation treatments were applied first and the fumigations were accomplished within 24 hr. Higher radiation dosages (10-50 had) followed 7 days later by methyl bromide fumigations generally killed more insects than did either treatment applied alone. A 7-day delay between the irradiation and fumigation provided a definite increase in insect mortality, but reversing the sequence of the treatments did not. The phosphine dosage tested was too high to fully assess the interaction of the radiation-fumigation treatments. However, irradiating the insects did not alter the effectiveness of phosphine when the fumigant alone produced mortalities in excess of 90%.

Document Type: Research Article

Publication date: February 1, 1972

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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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