Fenoxycarb controlled four major species of stored-product insects for 18 mo in rough rice treated with 5 or 10 ppm and stored in small bins. Malathion controlled susceptible insects but began to lose efficacy after 6-9 mo. Angoumois grain moths, Sitotroga cerealella (Olivier); lesser grain borers, Rhyzopertha dominica (F.); rice weevils, Sitophilus oryzae (L.); and red flour beetles, Tribolium castaneum (Herbst); were released near the bins and allowed equal access to all treatments. Several thousand of each species were released at approximately monthly intervals. All treatments were invaded approximately equally. Toxicity of fenoxycarb to adult insects was inconsequential but both rates virtually eliminated reproduction by Angoumois grain moths, lesser grain borers, and rice weevils in the bins and in laboratory bioassays for 18 mo. Angoumois grain moths resistant to malathion were controlled by fenoxycarb. Fenoxycarb did not affect germination of seed rice when applied alone or in combination with the fungicides carboxin and captafol.
Document Type: Research Article
Publication date: April 1, 1988
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