Control Effects of 40 % Mefenacet + Bensulfuron-methyl+ Acetochlor Wet Powder on Weeds in Seedling Throwing Paddyfield

The control effects of 40% Mefenacet +Bensulfuron -methyl +Acetochlor wettable powder (WP), 10% Bensulfuron-methyl WP, 50% Mefenacet WP, 20% Acetochlor and 60% Mefenacet +Bensulfuron-methyl WP on weeds in seedling throwing paddyfield were studied in this paper. The experimental results showed that when 40% Mefenacet+ Bensulfuron-methyl+Acetochlor WP applied at 5 to 7 days after rice seedling throwing, it could effectively control the common weeds in paddyfield, such as Barnyard -grass, Rotala, Sagittaria pygmaea, Monochoia vaginalis, Cyperus difformis and so on, with the dosage of 600~750 g/hm2. 40 days after treatment, the control effects of total plant and fresh weight for each kinds of grass was 83.8%~88.6% and 94.4%~96.4%, respectively, which were significant higher than the effects of control (60% Mefenacet +Bensulfuron-methyl WP of 600 g/hm2, 10% Bensulfuron-methyl WP of 300 g/hm2 and 50% Mefenacet WP of 750 g/hm2).