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杨树褐斑病(Marssonina brunnea)是杨树的常见叶斑病。该病在欧洲各国已普遍引起重视,意大利、法国以此病害作为防治的主攻目标,我国东北、华北、西北、华东和中南等地也均有发生和为害。杨树褐斑病一般6月开始发病,8月受害植株开始落叶,落叶期比正常植株提前2—3月。该病影响植株养份和水份的供给,干扰有机物质运输和积累,导致植株生长衰弱,降低生产量。据作者1982年在林科院杨树苗圃调
Poplar leaf spot (Marssonina brunnea) is a common leaf spot in poplar. The disease has drawn great attention in various countries in Europe. Italy and France regard this disease as the main target of prevention and treatment. Northeast China, North China, Northwest China, East China, Central South China and other places also have their occurrences and harms. Poplar brown spot disease generally began in June, August affected plants began deciduous, deciduous than normal plants 2-3 months in advance. The disease affects plant nutrient and water supply, interferes with the transport and accumulation of organic matter, leading to weak plant growth and reduced production. According to the author in 1982, Academy of Sciences poplar nursery tune