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Effects of Threshing and Drying on Maize Weevil Populations in Field-Infested Corn1

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Abstract:

These experiments quantified the effects of threshing and drying of field-ingfested corn, Zea mays L., on population densities of the maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae), going into storage. Sixty small field plots were planted to one of three hybrids ('Funk G-4507,' 'DeKalb 1214,' or 'Pioneer Brand 3030') and infested naturally or through artificial introduction. At harvest, the following were sampled for weevil population densities: standing field corn, undried seed from threshed ears (UNDRIED), the debris separated from this undried seed, dried seed from threshed ears (DRIED), and dried seed after 6 and 12 wk in storage (STOR-6 and STOR-12). Threshing separated 11, 18, and 19% of live weevils from the seed, and drying induced immediate weevil mortalities of 87, 86, and 91% (hybrids F-4507, D-1214, and P-3030, respectively). The combined population reductions caused by threshing and drying were calculated to be 89, 89, and 92% for hybrids F-4507, D-1214, and P-3030, respectively. Correlations between storage populations (STOR-6 and STOR-12) versus earlier populations (UNDRIED and DRIED) were highly significant (P<0.0001) with r2 values from 0.48 to 0.72. This suggests that sampling of seed after threshing may help in predicting future population densities in storage.

Document Type: Research Article

Publication date: April 1, 1988

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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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