茎叶处理除草剂对马齿苋的防除效果评价

Efficacy of Post-Emergence Herbicides on Portulaca oleracea

为了筛选对马齿苋防除效果好的除草剂,采用盆栽试验比较分析10种茎叶处理除草剂对马齿苋的防效。结果表明,在试验所设剂量,20%氯氟吡氧乙酸乳油、25%氟磺胺草醚水剂对2叶期-4叶期和6叶期-8叶期马齿苋防效可达100%。38%莠去津悬浮剂、480 g·L^(-1)麦草畏水剂和480 g·L^(-1)灭草松水剂对2叶期-4叶期马齿苋防效达100%,对6叶期-8叶期马齿苋有很好的抑制作用,鲜重防效好。30%苯唑草酮悬浮剂对2叶期-4叶期马齿苋鲜重防效为90.7%,但不能有效防除6叶期-8叶期马齿苋。40 g·L^(-1)烟嘧磺隆可分散油悬浮剂、10%硝磺草酮可分散油悬浮剂、25%辛酰溴苯腈乳油和84%氯酯磺草胺水分散粒剂不能有效防除马齿苋。

In order to screen the suitable herbicides for control Portulaca oleracea,the efficacy of 10 post-emergence herbicides were compared by pot experiment.The results showed that,the control effects of 20%fluroxypyr EC and 25%fomesafen AS on P.oleracea at 2 leaves-4 leaves and 6 leaves-8 leaves were 100%.38%atrazine SC,480 g·L^(-1)dicamba AS and 480 g·L^(-1)bentazone AS had 100%control effects on P.oleracea at 2 leaves-4 leaves and good control effects on fresh weight of P.oleracea at 6 leaves-8 leaves.The control effect of 30%topramezone SC on fresh weight of P.oleracea at 2 leaves-4 leaves was 90.7%,but it could not effectively control weed at 6 leaves-8 leaves.40 g·L^(-1)nicosulfuron OD,10%mesotrione OD,25%bromoxynil octanoate EC and 84%cloransulam-methyl WG could not effectively control P.oleracea.