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1材料与方法 试验于1991年在莱阳农学院梨园内进行,选择地力、树龄和树相、树冠大小相同,往年梨黑星病发病较重的园片作为试验园。试验用“8803”系辽宁省盖县农药厂新近生产的广谱高效杀菌剂,剂型为60%可湿性粉剂。处理设5月22日喷800倍“8803”和6月2日,6月13日、 6月 23日各
MATERIALS AND METHODS The experiment was conducted in the pear orchard of Laiyang Agricultural College in 1991, and the fertile ground, the tree age and the tree phase, the same crown size, and the heavier pears scab in previous years were selected as the test garden. Test “8803” Department of Liaoning Province, Gaixian Pesticide Factory recently produced broad-spectrum high-performance fungicide, dosage form is 60% WP. Processing set May 22 spray 800 times “8803” and June 2, June 13, June 23 each