The effect and security of 200 g/L Fluroxypyr-methyl EC on controlling annual gramineous weeds in corn field were studied.The result showed that 200 g/L Fluroxypyr-methyl EC had good control effect against annual broadleaf weeds in corn field at 750~1 050 ml/hm2.In 10 days after treatment,the preventing effects of 200 g/L Fluroxypyr-methyl EC at 750 ml/hm2,900 ml/hm2,1050 ml/hm2 on plant of Amaranthus retroflexus,Portulaca oleracea,Commelina communis were 87.9 %,90.9 %,93.7 % respectively.In 30 days after t...