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本病系我国杨树新发生的一种病害。病原菌的分生孢子有2种形状,无色透明、单胞,呈纺缍形孢子大小为1.64—2.74×9.59—13.7μm。线形孢子顶端弯钩状大小为1.37—1.78×15—27.4μm。病原菌适宜生长的培养基为PDA、麦芽粉、豆饼粉培养基;温度为25—32℃和pH6—10。本病于4月下旬发病,5月中下旬分生孢子成熟,6月中下旬为分生孢子飞散高峰期。经室内采用多菌灵、甲基托布津、福美砷的200倍液浸泡插穗30、60、90分钟处理均有药害,采用100—200倍液浸泡10分钟无药害,对病害有防效。造林地幼树可采用上述药剂的100倍液进行刮破病斑涂抹,防效可达87.5％。
The disease is a new disease in our poplar. Pathogen conidia have two kinds of shapes, colorless and transparent, single cells, Spinnera sporulating spore size of 1.64-2.74 × 9.59-13.7μm. The shape of the top of the linear spore hook is 1.37-1.78 × 15-27.4μm. Pathogen suitable medium for the growth of PDA, malt flour, soybean meal powder medium; temperature of 25-32 ℃ and pH6-10. The disease onset in late April, mid-and late May conidia mature, mid-and late June for the peak of conidial spatter. The indoor use of carbendazim, thiophanate-methyl, Fumei arsenic 200 times soaking cuttings 30,60,90 minutes have been treated injury, the use of 100-200 times soak for 10 minutes without injury, anti-disease effect . Afforestation saplings can be used 100 times the drug agent to scratch the spot smear, anti-efficiency up to 87.5%.