一、褐皮病的一些显著的特征(一)症状不排胶是褐皮病的一个容易辩认的症状。这种情况可能发生于部分割线或全割线,少数乳管列干枯时,割线还会正常产胶。当然,干枯不是褐皮病树独有的症状。比如根病树或严重缺水的开割树也会出现割线干枯。割线干枯发展到后来变褐色则是褐皮病独有的特征。本世纪早期在褐皮病方面 First, some significant features of brown skin disease (a) Symptoms of non-gel is a readily identifiable symptoms of brown skin disease. This situation may occur in part of the secant or secant, a small number of ducts dry, secant also normal plastic. Of course, dry is not unique symptoms of brown-eyed tree. Such as the root tree or a serious shortage of water cut the cuttings will appear dry. Secant dry development to later brown is the unique characteristics of brown-skin disease. Early this century in the case of brown skin disease