Abstract: For screening high-efficient and safe broadleaf weeds herbicides in flax fields,this study carried out application tests of 5 herbicides including 30%topramezone SC and 7 mixtures including 30%topramezone SC 180 mL/hm2+48%Bentazone AS 2 250 mL/hm2 by spraying on stems and leaves of flax seedlings.The results showed that 2 mixtures had excellent control effects on broadleaf weeds in flax fields.The plant and fresh weight control effects of 30%topramezone SC 180 mL/hm2+15%thifensulfuron methyl WP 225 g/hm2 were 90.63%and 77.50%,respectively.The plant and fresh weight control effects of 48%Bentazone AS 2 250 mL/hm2+15%thifensulfuron methyl WP 300 g/hm2 were 88.54%and 92.88%,respectively.The flax resumed growth after spraying 7 days and the 2 mixtures were safe for flax growth.In summary,the two mixtures had excellent control effects on broadleaf weeds.They were cheap and significantly increased the yield of flax so they should be popularized and applied in flax production.

Key words: Flax;Herbicide;Broadleaf weeds