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对26个大豆品种的种子进行了洗涤检验、分离培养、致病性测定及杀菌剂拌种防治大豆炭疽病的试验。经洗涤检验,发现大豆种子携带有9个属真菌,其中以 Peronospora 和 Colletotrichum 出现频率最高。经分离培养,检验到9个属的12种真菌,其中以紫斑病菌(Cercospora kikuchii)和炭疽病菌(C.glycines)出现频率最高。致病性测定结果表明,有9种真菌对大豆跃进五号种子都有不同程度的致病能力。七种杀菌剂防治菌期大豆炭疽病以70%甲基托布津可湿性粉剂、50%乙基托布津可湿性粉剂和50%退菌特可湿性粉剂防病效果最好,其次为3050+44号可湿性粉剂和50%多菌灵可湿性粉剂。以种子重量的0. 3%药量拌种为宜,并且无药害,对根系生长有一定的刺激作用。
Seeds of 26 soybean cultivars were tested for washing, isolation and culture, pathogenicity test and fungicide seed dressing to control soybean anthracnose. After washing test, it was found that the soybean seeds carried 9 fungi, of which Peronospora and Colletotrichum appeared the most frequently. After isolation and culture, 12 fungi of 9 genera were detected, of which Cercospora kikuchii and C.glycines appeared most frequently. The results of pathogenicity test showed that nine kinds of fungi had different degrees of pathogenicity to Soybean Yuejin No.5 seed. Seven kinds of fungicides control bacteria period soybean anthracnose with 70% methyl thiophanate wettable powder, 50% ethyl thiophanate wettable powder and 50% antibacterial wettable powder best preventive effect, followed by 3050 +44 Wettable powder and 50% carbendazim wettable powder. Seed dosage of 0. 3% seed dressing is appropriate, and no phytotoxicity on the root growth has a certain stimulating effect.