论文部分内容阅读
以3%井冈霉素A·(2亿芽胞/毫升)多粘类芽胞杆菌水剂为供试药剂,通过田间试验研究不同剂量、不同施药时期对水稻纹枯病的防治效果。2年试验结果表明,当用药量在45~90 g.a.i/hm~2时,药后20 d,发病初期(即病株率在5%以下)预先防治的田间防效达80.38%~89.06%,而发病期(即病株率在10%以上)施药的田间防效仅达41.12%~53.26%;在发病初期预先防治效果要明显优于发病期再施药,从而确定该药剂防治水稻纹枯病时期应适当前移。
A 3% validamycin A (200 million spore / ml) polymyxa hydrophila agent was used as test agent to study the control effect of rice sheath blight at different dosages and different application periods through field experiments. The results of two years showed that when the dosage was 45 ~ 90 gai / hm ~ 2, the control effect in early stage of disease was 80.38% ~ 89.06% at the early stage of disease (ie, the diseased plant rate was under 5% While the disease-controlling period (that is, the diseased plant rate was over 10%) was only 41.12% ~ 53.26% in the field. In the early stage of the disease, the prevention and cure effect was obviously better than that of the disease stage, so the rice grain control The period of blight should be properly advanced.