Environmental factors influencing growth and sporulation of Cercospora kikuchii [Purple stain disease of soybean].

Reference Report for IND80046613

Title:	Environmental factors influencing growth and sporulation of Cercospora kikuchii [Purple stain disease of soybean].
Authors:	Chen, M.D., Lyda, S.D., Halliwell, R.S.
Source:	Mycologia 1979, 71(6):1150-1157
Abstract:	C. kikuchii [causal agent of purple stain disease of soybean (Glycine max)] grew in 10 different liquid or solid media. Most growth was obtained in V-8-juice broth, yeast-extract and potato-dextrose broth, and the least growth occurred in nutrient broth or sterile distilled water. The fungus sporulated abundantly on V-8-juice agar and carrot-leaf-decoction agar, moderately on nutrient agar, yeast-extract agar and no conidia formed on water agar, cornmeal agar, malt-extract agar, malt agar or potato dextrose after 14 days at 28.degree. C. At 13.degree. C, the fungus sporulated in continuous light and in alternating light-dark periods (12 h/12 h) on V-8 juice agar, but in continuous darkness a 60% reduction in sporulation was noted. Higher temperatures (22 or 28 degree. C) seemed to counteract this phenomenon, as no significant differences in conidial counts were obtained at 28.degree. C in continuous darkness, alternating light and dark periods, or continuous light

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