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Activity of the Entomopathogenic Fungus Beauveria bassiana (Deuteromycota: Hyphomycetes) Against Three Coleopteran Pests of Stored Grain

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A Beauveria bassiana isolate from the rice water weevil, Lissorhoptrus oryzophilus Kuschel (Coleoptera: Curculionidae), was evaluated as a conidial powder against 3 coleopteran pests of stored grain: the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae); the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae); and the red flour beetle, Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae). Bioactivity of B. bassiana isolate 22292A was assessed on 3 types of food substrates (red flour beetle media, medium grain brown rice, and long grain rough rice) at 27°C and 60% RH. Adult mortality was 80–100% at the higher dosage levels for all insects tested on all media types at 21 d after treatment. Emergence of adult progeny on brown and rough rice was reduced by 83–99% at the 2 highest dosage level. The abrasive nature of rice hulls on the rough rice may contribute to the accelerated mortality seen on this medium.

Keywords: Beauveria bassiana; entomopathogenic fungus; lesser grain borer; red flour beetle; rice; rice weevil

Document Type: Research Article

Publication date: June 1, 1999

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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