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核桃树溃疡病在多数核桃产区都有分布,是一种真菌性病害,主要危害幼树主干、嫩枝和果实。一般被害株率20%～40%,造成提早落果,降低果实品质和产量。重病区被害株率可达70%～100%,造成植株生长衰弱、枯枝或整株死亡。一、危害症状核桃树溃疡病危害核桃苗木、大树的干部和主侧枝,多发生于树干基部0.5米～1.0米高度范围内。初期在树皮表面出现近圆形的褐色或黑色病斑,直径0.1厘米～2厘米。有的扩
Walnut tree canker disease is distributed in most walnut producing areas, is a fungal disease, the main damage to the trunk, shoots and fruits. General damage rate of 20% to 40%, resulting in early drop fruit, reduce fruit quality and yield. Severe ward victimization rate of up to 70% to 100%, resulting in weak plant growth, dead branches or whole plant death. First, the harmful effects of walnut tree canker pests walnut trees, tree cadres and main collateral, occurred in the base of the trunk 0.5 meters to 1.0 meters height range. The initial appearance of nearly round bark brown or black lesions, diameter of 0.1 cm to 2 cm. Some expansion