一、危害特征流胶病主要危害主干和主枝,主干和主枝受害初期,病部稍肿胀,早春树液开始流动时,从病部流出半透明黄色树胶,流出的树胶与空气接触后,变为红褐色,呈胶冻状,干燥后变为红褐色至茶褐色的坚硬胶块。二、发病原因 First, the harmful characteristics of the main hazards of plastic jelly Skeleton and main branches, trunk and main branches early victims, the Ministry of disease slightly swollen early spring sap flow began to flow from the Department of semitransparent yellow gum, out of gum contact with air, Becomes reddish-brown, jelly-like, dried to a hard brown to red-brown to brownish gum. Second, the cause of the disease