叶霉病是棚室番茄的重要病害,老百姓俗称“黑毛病”。该病严重影响叶片的生理功能,能导致番茄大幅度减产。一般损失在20%~30%左右,严重时可达50%~80%。一、症状识别番茄叶霉病主要为害叶片,严重时也为害茎、花和果实。叶片发病先从中、下部叶片开始,逐渐向上部叶片扩展。发病时叶片正面出现椭圆形或不规则形淡黄色褪绿斑,晚期病部生褐色霉层或坏死。叶背病部初生白色霉层,后变为紫灰色至黑色致密的绒状霉 Leaf mold is an important disease of greenhouse tomato, common people known as “black disease ”. The disease seriously affected the physiological functions of leaves, can lead to substantial tomato yield. The general loss of about 20% to 30%, severe up to 50% to 80%. First, the identification of symptoms of tomato leaf mold is the main damage leaves, but also in severe damage stems, flowers and fruits. Leaf disease first from the middle and lower leaves began to gradually expand to the upper leaves. Occurrence of the front of the leaves appear oval or irregular pale yellow faded green spot, advanced disease brown mold layer or necrosis. Leaf back disease Department white mold layer, after the purple to black to dense dense velvet mildew