通过田间药效试验明确50%吡氟酰草胺水分散粒剂对春小麦田阔叶杂草的防除效果和田间推荐使用剂量，结果表明，50%吡氟酰草胺水分散粒剂对小麦田杂草密花香薷、野油菜和酸模叶蓼的防除效果稍差，施药后40 d对杂草株数总体防效为53.01%~61.75%，鲜重总体防效为54.30%~58.03%。该药剂对小麦安全，较空白对照增产6.44%~8.52%。建议该药剂于春小麦3叶期前，杂草2叶期前进行茎叶喷雾处理。

Based on the field trials， the efficacy and recommended dosage of diflufenican 50% WG are determined for controlling broad-leaf weeds in spring wheat field. The result shows that diflufenican 50% WG had not good control effect to broad-leaved weeds. The integrated plant and fresh weight control effects are 53.01%~61.75% and 54.30%~58.03% on weeds respectively after 40 days after spaying. Diflufenican 50% WG had no significant effect on spring wheat growth and the yield increasing rate of spring wheat is 6.44%~8.52% after sparing. The proper period of spraying is 2 leaves in weeds (3 leaves in wheat).

S451.22

国家“十二五”科技支撑计划项目“农林重要杂草鼠害监控技术研发”(2012BAD19B02)