AGRICULTURE

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BIOLOGY AND CONTROL OF THE LESSER GRAIN BORER, Rhizopertha dominica Fabricius ( Coleoptera: Bostrichidae) ON WHEAT ( Triticumaestivum L).
(1993-05) ABDULLAHI, JAMILATU
The life cycle, flight ability, host preference, microorganisms associated with and chemical control of the lesser grain borer, Rhizopertha dominica F. was studied. On whole wheat, the life cycle took four weeks to complete but took five to six weeks on other test food materials. The adult insects were found to fly freely and measured 1.338-2.275mm in length. When the effect of R. dominica was compared on different host food materials, millet (Var. Sammil-1) was found to be the preferred host leading to more survivors during the development process, while wheat (Var. Samwhit-6) was suitable for shorter length of the life cycle. The micro-organisms Aspergillus niger. Rhizopus Spp.., Penicillium Spp. and an unidentified bacterium were found associated with the insect externally while Aspergillus Spp. and the same unidentified bacterium were found associated with the insect internally. The chemical insecticides Actellic 2% dust, Coopex 5% dust, Phostoxin tablets, lindane 5% dust and Quickphos tablets gave significantly high adult mortality three days after treatment than airtight and ventilated controls. All the chemicals suppressed progeny development and emergence after killing the parents with the exception of Actellic 2% dust