当前山药主要发生的病害有三种,分别是枯萎病、炭疽病和褐腐病。这三种病害主要通过雨水及浇水传播,而现在正处在高温多雨期,也为这三种病害的发生创造了条件。枯萎病症状:发病初期主要表现为茎基部出现梭形褐色斑块,病斑逐渐向四周扩展,导致茎基部表皮腐烂,上部叶片黄化脱落,藤蔓枯死,病茎内部变褐,块根染病会导致皮孔的四周产生圆形至不规则形褐色病斑。 There are three main diseases yam currently occur, namely wilt disease, anthracnose and brown rot disease. These three diseases are mainly spread by rain and water, and are now in a period of high temperature and rainy weather, which also creates conditions for the occurrence of these three diseases. Symptoms of Fusarium Wilt: The early stage of the disease mainly showed a spindle-shaped brown plaque at the base of the disease. The plaque gradually expanded to the periphery, causing the decay of the epidermis at the base of the stem, the yellowing of the upper leaves, the withering of the vine, the browning inside the diseased stem, Around the lenticular round to irregular brown spots.