The efficacy and persistence of diatomaceous earths admixed with commodity against four tropical stored product beetle pests |
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Authors: | TE Stathers M Denniff P Golob |
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Affiliation: | Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK |
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Abstract: | The efficacy and persistence of two commercially available enhanced diatomaceous earth (DE) products (Dryacide® and Protect-It®) against four common tropical storage pests (Prostephanus truncatus, Sitophilus zeamais, Callosobruchus maculatus and Acanthoscelides obtectus) were studied when admixed with typical host commodities at different application rates and relative humidities. Persistence of the enhanced DE treatments was considered after 3 and 6 months storage by assessment of both adult mortality and F1 progeny emergence. Both DEs usually increased parental mortality and reduced progeny emergence of all four insect species in comparison with the untreated control at both 50% and 60% r.h., and at all storage periods. However, efficacy was inversely related to duration of storage and over time the host commodity also became less suitable for insect development. Each insect species differed in its susceptibility to the DE treatments, highlighting the need for field application rates to be based upon the entire spectrum of pest species likely to be present during storage. |
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Keywords: | Diatomaceous earth Inert dust Stored product pest management Persistence Prostephanus truncatus Sitophilus zeamais Callosobruchus maculatus Acanthoscelides obtectus Maize Cowpea Kidney or common bean |
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