Field experiment was conducted to evaluate the bio-efficacy of Metamifop 10 EC and its phytotoxicity and residues in direct seeded rice. The treatments comprised of different weed management practices viz., metamifop 10 EC at 50, 75, 100 and 125 g a.i ha-1 at 2-3 leaf stage of weeds; metamifop 10 EC at 50, 75, 100, 125 and 200 g a.i ha-1 at 5-6 leaf stage; Pre-emergence application of pretilachlor S at 0.45 kg a.i ha-1 as pre emergence with one hand weeding on 30 - 35 DAS ; cyhalofop butyl 10 EC at 100 g ai ha-1 as post emergence herbicide at 15 DAS: weed free check and unweeded control. The common weeds of the experimental field consisted of grasses, sedges and broad leaved weeds (BLW). Application of metamifop 10 EC at 125 g ai ha-1 sprayed at 2-3 leaf stage was comparable with pretilachlor S at 0.45 kg a.i ha-1 as pre emergence with one hand weeding on 30 - 35 DAS in the control of grasses at 30 and 60 DAS. Metamifop 10 EC at 125 g a.i ha-1 at 2-3 leaf stage and metamifop 10 EC at 200 g a.i ha-1 at 5-6 leaf stage was better in controlling grass weeds than pretilachlor S at 0.45 kg a.i ha-1 as pre emergence with one hand weeding on 30-35 DAS at 30 DAS. For direct seeded low land rice post-emergence application of metamifop 10 EC at 2-3 leaf stage was found to be effective in controlling grass weeds than application of metamifop 10 EC at 5-6 leaf stage. Metamifop 10 EC at 125 g a.i ha-1 at 2-3 leaf stage was found to be best in controlling grass weeds.
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