单株培养不产生卵孢子。
其主要侵染来源是土壤中和植物病残体上越冬的卵孢子。
The primary source of infection was the oospore overwintered in soil and plant survival.
在离体接种情况下，叶片中产生卵孢子数量大于茎中产生卵孢子数量；
The numbers of produced oospore in the detached leaves were more than those in the stems.
在离体接种情况下，叶片中产生卵孢子数量大于茎中产生卵孢子数量；
The numbers of produced oospore in the detached leaves were more than those in the stems.
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