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Spore Germination and Hyphal Growth of Beauveria sp. on Insect Lipids

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The effect of cuticular lipids of Ostrinia nubilalis (Hübner) and Melolontha melolontha (L.) spore germination and hyphal growth of entomopathogenous fungi was examined. A Beauveria bassiana strain virulent to O. nubilalis and a Beauveria brogniartii strain virulent to M. melolontha were used. The epicuticular lipid-extract of the host insect did not alter the growth of the corresponding virulent strain measured both as spore germination or hyphal growth. However, the cuticular pentane-extract of M. melolotha inhibited both the hyphal growth and spore germination of the nonpathogenic strain of B. bassiana. The hyphal inhibition was caused mostly by the unsaturated hydrocarbon fraction. Methanol-extracts of both insects inhibited hyphal growth and spore germination of the 2 virulent and nonvirulent strains. Exposure to O. nubilalis lipid extract most strongly inhibited hyphal growth of both strains.

Document Type: Research Article

Publication date: February 1, 1997

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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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