常见例句双语例句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。 返回 infection hypha