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黄瓜黑星病 Cladosporium cucumerinumEll.et Arth.是一种严重的流行病,在我国东北三省和内蒙古普遍发生,使生产受到很大损失。在辽宁省丹东地区自1980年以来,此病发生和为害越来越重,1984年后每年使黄瓜减产2250万公斤。对黄瓜黑星病的研究报告甚少,房德纯等(1985)及袁美丽等(1986)曾作过报道。笔者从1984年秋开始研究黄瓜黑星病,三年来基本摸清了病原菌的生物学特性和侵染规律,找出了有效防治药剂黄瓜宁1号和2号,在黄瓜生长期防效达90～100%。一、黄瓜黑星病病原菌生物学(一)发病植株症状据1985～1986年在丹东郊区和凤城县调查,此病对保护地和露地黄瓜为害均较重。温室及立壕一般4月初发病,大棚瓜在4月下旬
Cladosporium cucumerinumEll.et Arth. Is a serious epidemic that has been widespread in the three northeastern provinces and Inner Mongolia, causing huge losses in production. In Dandong, Liaoning Province, the disease has become more and more serious since 1980, and cucumber production has been reduced by 22.5 million kilograms since 1984. There are few reports on scab’s scab, reported by Fang et al. (1985) and Yuan Meili et al. (1986). The author started to study cucumber scab in the autumn of 1984 and basically found out the biological characteristics and infection rules of the pathogenic bacteria in the past three years and found effective cucumber cucumber Ning No.1 and No.2, 100%. First, cucumber scab pathogens biology (a) the incidence of plant symptoms According to 1985 to 1986 in the suburbs of Dandong and Fengcheng survey, the disease on the protected area and open cucumber damage are heavier. Greenhouse and vertical trench incidence in early April, shed melon in late April