蘆筍莖枯病之研究 (Ⅰ)品種間感受性及發病消長情形

Abstract

美麗華盛頓爲莖枯病感受品種，加州500次之，UC72更次之，而以UC66之感受性最低。美麗華盛頓之莖枯病8月間罹病度90.4%發病最厲，9月間80.4%次之，而冬季12月至3月間之發病率最低，又春季爲本病越年潛伏病菌之第一次侵入感染時期，筍芽出土2天至4天內，即有部份被侵入而感染，夏季盛發時期，筍芽出土5天至10天即出現病斑，出土5.2天每株平均病斑數爲10個。 The disease attacked the aerial parts of the plant was confined to bud scales and expand gradually toward the upper parts of the scale leaf. The first typical small lesion appeared at 5 to 10 days after the young stems emerged from soil in summer time.