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ABSTRACT
Rates of linear extension of mycelia of zoospore progenies of two tested isolates of Phytophthora parasitica were relatively uniform and similar to their respective parent. There was a continuous quantitative variation, however, in growth rate of progenies of selfed oospores. The character of colony pattern also showed variation in oospore progenies but not zoospore progenies. Results of the study suggest that heterozygous polygenes were involved in determining growth rate and colony morphology of these fungi and support the hypothesis that species of Phytophthora are diploid during the vegetative phase.