怎样防治豆角病害豆角上主要的病害有豆角锈病（也为害菜豆）和豆角细菌性角斑病。一、豆角锈病１、症状特点：主要为害叶片，严重时也为害叶柄和豆荚。发病初期多在叶背出现黄色小斑点，稍突起，后转为锈褐色，扩大发展为红褐色夏孢子堆，表皮破裂，散发出红褐色粉末，是... How to prevent beans diseases The main diseases on beans are beans rust (also harm the beans) and angular bacterial angular leaf disease. First, the pest rust 1, the symptom characteristics: the main damage leaves, pests and pests in severe damage. Occurred early in the leaves appear more yellow spots on the back, a little protruding, turn to rust brown, expand the development of red brown summer spore reactor, the epidermis rupture, emitting reddish brown powder, is ...