枯草芽孢杆菌可湿性粉剂对玉米大斑病的田间防效

Field Efficacy of Bacillus subtilis Wettable Powders against Northern Corn Leaf Blight

玉米大斑病发生期,在田间采用不同处理方式对玉米大斑病进行处理,并测定其对玉米大斑病的田间防治效果及其对玉米的安全性。结果表明,4种施药处理对玉米大斑病均有一定防效,枯草芽孢杆菌单次用量300g/hm2喷药2次、450g/hm2喷药1次、300g/hm2加高效助剂有机硅75g/hm2喷药2次、450g/hm2加高效助剂有机硅75g/hm2喷药1次的防治效果分别为81.25%,68.45%,82.63%,74.33%;试验剂量范围内,枯草芽孢杆菌对玉米生长安全;其中,枯草芽孢杆菌单次用量300g/hm2喷药2次对玉米大斑病有很好的防治作用,可在生产上大面积使用。

To test field efficacy and safety of Bacillus subtilis wettable powders against northern corn leaf blight, 4 treatments of Bacillus subtilis wettable powders spraying were applied in the field in the period of corn leaf blight occurrence. 4 treatments all showed control efficacy to northern corn leaf blight. The control efficacy of spraying 300 g every hectare twice, spraying 450 g every hectare once, spraying 300 g every hectare added 75 g organosilicone every hectare twice and spraying 450 g every hectare added 75 g organosilicone every hectare once were 81.25% ,68.45% ,82.63% and 74.33% respectively. Bacillus subtilis is safe to the corn plants at the tested dosage range. Spraying 300 g Bacillus subtilis every hectare twice exhibit satisfactory control efficacy against northern corn leaf blight, and might be recommended for corn production.