Pathogenicity ofCylindrocladium clavatumCausing Potato Tuber Rot

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Abstract
Peanut, eucalyptus, soybean, pepper, tomato, tobacco, papaya and eggplant were tested for response to artificial inoculation with C. clavatum isolated from a potato tuber. Tobacco, tomato, papaya and eggplant were not affected by C. clavatum; severe root rot developed on peanut and eucalyptus; soybean and pepper showed slight to moderate symptoms of root infection. An in vitro soil temperature of 25.degree. C and moisture level of -3 bars were more favorable for tuber surface rot development than lower soil temperatures or a soil moisture level of -86 bars. Tuber rot was less at 15 and 20.degree. C; at 10.degree. C no measurable disease resulted. The optimum temperature for vegetative growth and conidial germination of C. clavatum correlates well with the effect of soil temperature on disease development on potato tubers.

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