根腐病、赤斑病、青枯死杆病和锈病是蚕豆四大主要病害。 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 Root rot, red spot, green dead stems and rust is the four major diseases Vicia faba. 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, while the whole leaf becomes darker