A diatomaceous earth produced 100% mortality in rice weevils, Sitophilus oryzae (L.), and confused flour beetles, Tribolium confusum Jacquelin duVal, exposed for 21 days in rough rice treated with dosages of 1.75 and 3.5 g/kg, respectively. Milled and brown rice required dosages of 3.5 and 5.25 g/kg, respectively, to effect 100% rice weevil mortality. More than 56 days were required to effect 100% mortality in confused flour beetles in brown rice treated with 7.0 g/kg. Lower mortalities in milled and brown rice appeared to result from saturation of the diatomaceous earth by oils from the surface of the lice kernels. In brown rice, aged treatments produced lower rice weevil mortalities than did fresh treatments, and preconditioning of the dust by exposing it to milled or brown rice rendered it less effective against confused flour beetles when it was removed after 21 days and applied to rough rice.
Document Type: Research Article
Publication date: October 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.