Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10138753 | Journal of Stored Products Research | 2018 | 13 Pages |
Abstract
The efficacy of filter cake and Triplex powders applied to wheat was evaluated in the laboratory against the maize weevil, Sitophilus zeamais Motschulsky and rice weevil, Sitophilus oryzae (Linnaeus)-two most common insect pests associated with stored grain in Ethiopia. Efficacy of these powders was determined by exposing 20 adults of each species to 100â¯g of wheat treated with 0, 100, 500, 700 and 1000â¯mg/kg of filter cake and Triplex. Adult mortality was determined 7 and 14â¯d after exposure. In addition, adult progeny production, percentage of insect damaged kernels, and percentage of grain weight loss at each species-powder-concentration-time combinations were determined after 42â¯d. The 7 and 14â¯d mortality was 100% for adults of both species exposed to 1000â¯mg/kg of filter cake; only the 14â¯d mortality of Sitophilus species was 100% for adults exposed to 700â¯mg/kg. Mortality of S. oryzae adults was 100% when exposed for 14â¯d to1000â¯mg/kg of Triplex. Mortality of S. zeamais never reached 100% in any Triplex treatments. Adult progeny production of S. zeamais was completely suppressed at filter cake concentrations of 700 and 1000â¯mg/kg, whereas 1000â¯mg/kg was necessary for complete suppression of S. oryzae adult progeny production. Complete suppression of adult progeny production was not observed in any Triplex treatments. Complete reduction in percentage of insect damaged kernels and percentage of grain weight loss were obtained when S. zeamais and S. oryzae adults were exposed to 1000â¯mg/kg of filter cake; similar reductions with S. zeamais occurred only at 1000â¯mg/kg of Triplex. In the case of S. oryzae, complete reduction of insect damaged kernels and grain weight loss were not achieved at any concentration of Triplex. These powders can be used as alternatives to chemical insecticides for management of Sitophilus species.
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Authors
Tesfaye M. Tadesse, Bhadriraju Subramanyam,