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.

不少人由于不掌握优生优育知识，导致了一例例病残儿的出生，给家庭和社会带来了沉重的负担。

But due to inexperienced prospective parents, some babies were born with birth defects, which places a heavy burden on their families and on society as well.

病菌以菌丝体在种球内，或以菌丝体、厚垣袍子及菌核随病残体在土壤中越冬，成为翌年的主要初侵染源。

The main source of primary infection comes from hypha, akinetes and sclerotiums over-wintering in the bulb, residues of diseased plants and the soil.