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Malathion at 8 p.p.m. as dust or spray on polished rice gave excellent protection from damage by the rice weevil, Sitophilus oryzae (L.), during a 5-month storage period. Four p.p.m. gave complete protection from the flat grain beetle, Cryptolestes pusillus (SchÖnherr.). Less protection from damage by the red flour beetle, Tribolium castaneum (Herbst), was obtained. Effectiveness of the residue against the rice weevil in a 4 p.p.m. treatment appeared to be decreasing at 3 months. Bioassay of malathion residue with adult rice weevils on rice after 5 months storage showed that at 8 p.p.m. It mortality of 100% was obtained after 10 days' exposure.
Document Type: Research Article
Publication date: April 1, 1962
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.