This paper dealt with the influences of different media, temperature, light and pH to the amount of oospore formation. The results showed that millet agar, bai yun beau agar and soybean agar provided the favorable condition for oospore formation, the number of oospores was 131.6~149.6 /cm2, but a few oospores was formation on frozen pea agar. The results also suggested that the optimal conditions for oospore formation were 18℃, pH7 and darkness. The oospores failed to be formed tinder fluorescent or black light.
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