Journal of agricultural research . _~^ i/ Fig. I.—Cercospora beticola: A, Section of overwintered sugar-beet leaf showing embedded sclerotia-likebody, a, with a mass of old conidiophores, b, from which a new conidium, c, was produced. B. Produc-tion of rather typical conidiophores, b, and conidia, c, from a sclerotia-like mass, a, taken from over-wintered hst material and placed in hanging-drop cultures. Apr. 3, 1916 Climatic Conditions and Cercospora beticola 23 CONIDIA Thiimen (1886, p. 50-54) ^ believed that the spores of Cercospora beti-cola are able to live for a certain length of ti
Journal of agricultural research . _~^ i/ Fig. I.—Cercospora beticola: A, Section of overwintered sugar-beet leaf showing embedded sclerotia-likebody, a, with a mass of old conidiophores, b, from which a new conidium, c, was produced. B. Produc-tion of rather typical conidiophores, b, and conidia, c, from a sclerotia-like mass, a, taken from over-wintered hst material and placed in hanging-drop cultures. Apr. 3, 1916 Climatic Conditions and Cercospora beticola 23 CONIDIA Thiimen (1886, p. 50-54) ^ believed that the spores of Cercospora beti-cola are able to live for a certain length of time in the soil and retain theirviability and produce new infection, and Pammel (1891, p. 238-243) andMassee (1906, p. 52-53) accord with this view. In the investigationshere considered it was found that when kept dry, as in the case of her-barium material, the conidia remained viable for 8 months (Table I,tests 10 to 13), but soon after that no growth occurred. Only rarelywere conidia found on the infected areas of the leaves which were exp
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913
