Abstract
It was found that the optimum temperature range for mycelial growth and spore germination of Thielaviopsis paradoxa lies between 28° and 32° C, with the maximum above 36° C. and the minimum below 12° C. Neither mycelial growth nor spore germination was obtained at 8° or at 40° C. Pathogenicity of T. paradoxa to sugarcane variety P.R. 1059 was favored by temperatures between 28° and 32° C. No infection of sugarcane by this fungus occurred at 8° or at 40° C. The highest rate of infection of sugarcane by T. paradoxa was obtained at the lowest soil moisture with a maximum temperature up to 32° C. It thus appears that low soil moisture has a profound effect on rate of infection during summer months in Puerto Rico.Downloads
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