Applied Entomology and Zoology
Online ISSN : 1347-605X
Print ISSN : 0003-6862
ISSN-L : 0003-6862
Toxicity of Free Fatty Acids on the Larval Surfaces of Two Lepidopterous Insects trowards Beauveria bassiana (BALS.) VUILL. and Paecilomyces fumoso-roseus (WIZE) BROWN et SMITH (Deuteromycetes : Moniliales)
Tsutomu SAITOJoji AOKI
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1983 Volume 18 Issue 2 Pages 225-233

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Abstract
Free fatty acids (C : 8 to C : 20) were detected qualitatively and quantitatively from lipids present on external surfaces of the silkworm (Bombyx mori) and the fall webworm (Hyphantria cunea). The major component of the fatty acids was linoleinic acid (C : 18-3), and the amount of short-chain fatty acids was small. The total contents of free fatty acids and the composition of each free fatty acid in the integument of the silkworm changed quantitatively with larval growth. The short-chain fatty acids (C : 6 to C : 12) inhibited conidial germinations and hyphal growths of Beauveria bassiana and Paecilomyces fumoso-roseus, whereas some long-chain fatty acids supprted the growths of both fungi. Though these short-chain fatty acids acted fungistatically to conidial germination, the conidia treated with capric acid (C : 10) lost their pathogenicity toward the silkworm larvae.
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© the Japanese Society of Applied Entomology and Zoology
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