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前言苹果树腐烂病(Valsa mali Miyadeetyamad(?))是亚洲特有的果树病害。也是我国北方苹果产区普遍发生,危害最严重的病害。现将我场试验研究结果介绍如下:材料、内容和方法 1.供试药剂:①抗生素 S-921浓缩液。②抗生素 S-113浓缩液。③抗生素S-64浓缩液(以上三种生物药剂是由河北省科学院
Introduction Valsa mali Miyadeetyamad (?) Is an endemic fruit tree disease in Asia. It is also a common occurrence in the apple producing areas in the north of our country, which is most seriously endangered. Now my field test results are described below: Materials, content and methods 1. Test agents: ① antibiotic S-921 concentrate. ② antibiotic S-113 concentrate. ③ antibiotics S-64 concentrate (more than three biological agents by the Hebei Academy of Sciences