梨黑星病是梨树的重要病害之一,在我地区每年均有不同程度的发生。栽培品种中以南果梨、鸭梨和秋白梨等品种发病率最高。1986年我市梨黑星病发病株数达130余万株,占全市梨树总株数的94％,病果率达65.8％,减产约600万公斤,直接经济损失740多万元, Pear scab is one of the most important diseases of pear tree, which occur to varying degrees every year in our region. Among cultivars, the highest incidence was found in the varieties of Nanguo pear, Ya pear and autumn pear. In 1986, the number of pears scab in our city reached more than 1.3 million, accounting for 94% of the total number of pear trees in the city, with a disease-free rate of 65.8%, a yield reduction of 6 million kilograms and a direct economic loss of 7.4 million yuan.