oa African Entomology - Effects of sublethal doses of insecticides on population growth of mixed populations of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) and Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) at two temperatures
Population growth in mixed cultures of Prosteplumus truncatus (Hom) and Sitophilus zeamais (Motschulsky) on maize treated with sublethal doses of pirimiphos-methyl, permethrin and 'cocktails' of permethrin and pirimiphos-methyl was investigated at 25 C and 30C and 70 % relative humidity. Pirimiphos-methyl alone, or in combination with permethrin at 2 ppm caused 100 % mortality in S. zeamais. After exposure to all other treatments the mortalities and population growth rates of both species were very similar to the untreated controls. At 25 C, population growth in S. zeamais was inhibited irrespective of any pesticide treatment.
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