STUDIES ON THE PHYSIOLOGY OF ELSINOE VENETA

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Abstract
A study was made of the effect of certain nutritional and environmental factors on the growth and pigmentation of the mycelium, the sporulation, and the germination of the conidia of a "convoluted" isolate of Eisinoe veneta. the fungus responsible for the anthracnose disease of raspberries. This isolate utilized with varying degrees of efficiency various mono-, oligo-, and polysaccharides as well as certain organic alcohols as its sole source of carbon for growth. Either a nitrate, ammonium, amino, or imidazole N compound supported the fungus in culture. Max. growth of the mycelium occurred in the presence of soluble starch and asparagine, whereas opt. sporulation of the conidia was obtained on media containing potato starch and sodium nitrate. In general, the production of conidia was markedly reduced on media favorable for excessive vegetative growth. Both a decrease in the vol. of the medium and in the concn. of either a specific nutrient or of total nutrients adversely influenced the production of mycelium. Temps. above 30[degree]C. and below 21[degree]C. decreased the percentage germination of conidia and restricted the growth of the fungus. Growth and sporulation occurred over a wide range of pH values. The opt. initial pH for both growth and sporulation was 4.0. E. veneta produced conidia and grew well both in continuous darkness and in alternate diffuse light and darkness. Young potted raspberry plants, growing in the greenhouse and inoculated with conidia produced in culture, developed typical anthracnose lesions on the canes.

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