根腐病、赤斑病、青枯死杆病和锈病是蚕豆四种主要病害。(1)根腐病是一种真菌性病害。发病后,植株矮小、叶片发黄,主根和茎根变黑。根瘤菌减少。但最明显的特征是植株下部叶片的叶缘变黑,严重时整叶变黑焦枯。此病一旦发生,可使蚕豆减产3—5成。在防治上,如果病害已经发生,可及时用灰粪拌磷钾肥点蔸或开沟埋施,并用50%多菌灵或 Root rot, red spot, green dead stem and rust are the four major diseases Vicia faba. (1) Root rot is a fungal disease. After onset, the plants are short, the leaves are yellow, and the main roots and stem roots turn black. Rhizobia reduced. However, the most obvious feature is that the leaf margin of the leaves of the lower part of the plant becomes black, and in the severe case the whole leaf becomes dark and scorched. Once the disease occurs, can make broad bean cut 3-5. In the prevention and control, if the disease has occurred, it can promptly use gray manure Phosphorus or bituminous tilling point buried or trenching facilities, and use 50% carbendazim or