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Alginate Pellet Formulation of a Beauveria bassiana (Fungi: Hyphomycetes) Isolate Pathogenic to Cereal Aphids

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An isolate of Beauveria bassiana (Balsamo) Vuille"minderived from aphids was grown in liquid media and formulated in alginate pellets with or without the addition of wheat bran. Biomass production in Sabouraud's broth + 1% yeast extract (SBY)was significantly higher than in potato dextrose broth. After 1 wk in SBY,yields averaged 3,080 pellets per liter. Pellets without bran weighed an average of 4.6 mg each, and pellets with bran weighed 9.4 mg each. After 5 rno storage, the fungus sporulated more profusely from pellets with bran (2.5 x lOS conidia per pellet) than from pellets without bran (1.8 x lOS conidia per pellet). Sporulating pellets were placed on wheat seedling infested with green bug, Schizaphis graminum (Rondani), and incubated at high humidity. After 9-15 d, 3-44% of aphids killed by Beauveria were observed on wheat where pellets were added versus 0% in controls. The potential for use of pelletized B. bassiana for aphid control is discussed.

Document Type: Research Article

Publication date: December 1, 1990

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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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