枯草芽孢杆菌可湿性粉剂对玉米大斑病的田间防效

摘要

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 com leaf blight,and might be recommended for corn production.%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300 g/hm2喷药2次、450 g/hm2喷药1次、300 g/hm2加高效助剂有机硅75 g/hm2喷药2次、450 g/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300 g/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.