70%苯嘧磺草胺水分散粒剂防除冬小麦田阔叶杂草田间药效试验

Effect of bensulfuronamide 70%WG on the control of broadleaved weeds in wheat fields and the safety to wheat

为了明确70%苯嘧磺草胺水分散粒剂(WG)防除冬小麦田阔叶杂草的效果和对小麦的安全性。在田间条件下,采用茎叶喷雾处理的方法,参照农药田间药效试验准则开展了田间试验。试验结果表明,药后4d,70%苯嘧磺草胺WG 15~90 g/hm^2对小麦产生轻微药害,但药害症状可消失,不影响小麦生长与发育;药后30 d,70%苯嘧磺草胺WG 45~90 g/hm^2对冬小麦田稻槎菜、碎米荠、野老鹳草的株防效和鲜重防效都高于对照药剂10%唑草酮WP,70%苯嘧磺草胺WG 30~90 g/hm^2的总草株防效和鲜重防效也都高于对照药剂10%唑草酮WP。70%苯嘧磺草胺WG对冬小麦田阔叶杂草具有较好防效,且对小麦安全,建议在冬小麦3叶至分蘖期使用,施用制剂量为30~60 g/hm^2。

This study aims to determine the efficacy of bensulfuronamide 70%WG against the broad-leaved weeds in winter wheat fields and the safety to wheat.The field experiments were carried out under the field conditions with the method of spray treatment of stems and leaves,referring to pesticide field efficacy trials.The results showed that bensulfuronamine 70%WG applied at 15~90 g/hm^2 could produce contact killing spots on wheat,but it did not affect growth and development of wheat;the stem control effects and fresh weight control effects against Lapsanastrum apogonoides,Cardamine hirsuta and Geranium carolinianum,and against all weeds were higher than those of the control product respectively 30 days after treatment.Bensulfuronamide 70%WG has good control effect on broad-leaved weeds in wheat field,and it is safe to wheat.It is recommended to use from 3-leaf stage to tillering stage of wheat,and the recommended use dosage is 30~60 g/hm^2.