核桃细菌性黑斑病又称核桃黑腐病或核桃细菌性枯萎病,由细菌Xanthomonas juglandis(Pierce)Dowson引起,是我区核桃树的一大病害。主要危害核桃苗及成年树的叶和果,也危害新梢、花和芽,引起叶枯死或早期落果。一般被害株率达30—70％,核仁减重40—50％,出油率减少近半,严重地威胁我区的核桃生产。 为使我区在核桃生产的布局及品种的选择 Walnut bacterial black spot, also known as walnut black rot or walnut bacterial wilt, caused by the bacteria Xanthomonas juglandis (Pierce) Dowson, is a major disease in our region walnut trees. The main hazards of walnut seedlings and adult trees, leaves and fruits, but also endanger shoots, flowers and buds, causing leaf blight or early drop fruit. General strain of victims of 30-70%, 40-50% weight loss of kernels, oil yield reduction of nearly half, a serious threat to my area of ​​walnut production. To make my district in walnut production layout and variety of choice