梨黑星病是梨树的主要病害 ,黄河故道地区发生普遍 ,多雨年份发生尤为严重。目前 ,化学防治仍是控制该病发生流行的主要手段 ,为选择适宜的药剂和剂量 ,1999年我们进行了该项试验 ,现将结果报告如下 :1　材料与方法1.1　供试药剂40 %纹霉星可湿性粉剂 (上海农乐生物制品股份有? Pear scab is the main disease of pear tree, the Yellow River is common in the old area, especially in rainy years. At present, chemical control is still the main means to control the epidemic of the disease, in order to select the appropriate dose and dose, we conducted the test in 1999, the results are reported as follows: 1 Materials and methods 1.1 for the test agent 40% Star WP (Shanghai Nongle Biological Products shares?