Comparison of some insecticides for effectiveness against the maize weevil Sitophilus zeamais (Coleoptera: Curculionidae) on stored sorghum at Bako
1996
Adane Kasa | Abraham Tadese (IAR, Addis Abeba (Ethiopia))
The effectiveness of some insecticides for the control of the maize weevil, Sitophilus zeamais (Motsch.) on stored sorghum was evaluated in the laboratory at Bako Research Center in 1991 and 1992. Wood ash, neem seed and leaf were also tested. Each treatment was applied at three rates and there were four replications arranged in a completely randomized design. Mortality of adult weevils, progeny emergence, control efficacy and seed germination were used as the criteria to evaluate effectiveness between the treatments. The two years' average result indicated a highly (P less than 0.0001) significant differences among insecticides in all parameters considered. All insecticides except permethrine inflicted high mortality, low progeny emergence and high control efficacy at all rates tested. Grains treated with permethrine at the rates of 2 and 4 ppm gave a relatively low mortality, high progeny emergence and low control efficacy. Generally, the efficacy of the tested insecticides ranged between 79 and 100 percent. In both years wood ash, neem seed and leaf powder showed a promising potential for further investigation. Percentage seed germination in all treatments ranged between 92.5 and 99.5 percent.
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