核桃黑斑病，又名细菌性黑斑病，在我国华北、西北、华东、东北各省核桃产区均有发生。它是由核桃黄极毛杆菌引起，通过雨水、风及昆虫传播，为害核桃果实、叶片和新梢。近年来，核桃黑斑病的发生为害逐年加重，一般核桃园为害造成２０％～３０％黑果率，重者达７０％～８０％ Walnut black spot disease, also known as bacterial black spot disease, in our country in North China, Northwest China, East China, the northeastern provinces walnut producing areas have occurred. It is caused by the walnut yellow curly bacillus, spread by rain, wind and insects, harmful walnut fruit, leaves and shoots. In recent years, the occurrence of black spot disease walnut increased year by year, the general damage caused by walnut 20% ~ 30% black fruit rate, severe cases of 70% to 80%