6种除草剂对宁夏稗草的防治效果

The Effect of Six Herbicides on Barnyardgrass Control in Ningxia Rice Field

[目的]筛选防除宁夏水稻田稗草的合适除草剂。[方法]选用6种除草剂进行田间茎叶喷雾试验,测定对稗草的株防效及鲜重防效,观察对水稻的安全性。[结果]50%二氯喹啉酸WP、25 g/L五氟磺草胺OD、5%嘧啶肟草醚EC、34%敌稗EC对稗草防效较差,30 d株防效分别为55.2%、59.7%～68.6%、68.0%、34.9%,鲜重防效分别为57.9%、60.1%～68.4%、66.4%、34.2%。10%唑酰草胺EC对稗草防效较好,株防效为98.6%～99.6%,但用量大易对水稻产生药害。100 g/L氰氟草酯EC对水稻安全,且对稗草防效好,株防效可达95.7%以上。[结论]氰氟草酯是目前防治宁夏水田稗草的理想药剂。

[Aims ] This study aims to screen out the optimal herbicides to control barnyardgrass in Ningxia rice field.[Methods ] The efficiency of six herbicides in barnyardgrass control was assayed with foliar application and their influence to rice was evaluated.[Results ] The results indicated the effect of quinclorac 50% WP, penoxsulam 25 g/L OD, pyribenzoxim 5% EC and propanil 34% EC were low, which were 55.2, 59.7-68.6, 68.0, 34.9% in strain control and 57.9, 60.1-68.4, 66.4, 34.2% in fresh weight control, respectively. The control efficacy of metamifop 10% EC to barnyardgrass was high, which was 98.6-99.6%. But metamifop would cause rice damage at high dose. Cyhalofop-butyl 100 g/L EC could control more than 95.7% barnyardgrass with high safety.[Conclusions ] The optimal herbicide cyhalofop-butyl could be used in Ningxia rice field to control barnyardgrass.