叶霉病是一种真菌性病害，仅危害番茄，是保护地番茄的一种重要病害，可造成20％～3O％的减产，必须加以防治。一、发生症状叶片、叶柄和果实均可受害，但以叶片为主。发病初期，多在叶片背面形成圆形或不规则形白色霉斑。霉斑多时可相互融合，布满叶背面，颜色变成灰紫色或墨 Leaf mold is a fungal disease, only harmful to tomatoes, is an important tomato disease in the protected areas, can cause 20% ~ 3O% of the cut, must be controlled. First, the occurrence of symptoms of leaves, petioles and fruits can be victimized, but mainly leaves. Early onset, mostly in the blade back to form a circular or irregular white mildew. Mildew can be combined with each other for a long time, covered with the back of the leaves, the color becomes gray purple or ink