• 1. primary source of infection: 初侵染源
• 2. source of primary infection: 初侵染源

• 1.The primary source of infection was the oospore overwintered in soil and plant survival.
  其主要侵染来源是土壤中和植物病残体上越冬的卵孢子。
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• 2.Primary infection source may be reduced by breeding and selecting the variety with the lower infected seedling rate of seed-borne SMV.
  可以通过选育和筛选种传病苗率低的品种推广，减少本病的初次侵染来源。
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• 3.The main source of primary infection comes from hypha, akinetes and sclerotiums over-wintering in the bulb, residues of diseased plants and the soil.
  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。
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