Author(s): SUBRATA KR. GHOSH, PRITAM GHOSH, SANKAR SAHA, R K. GHOSH, AND J.MUKHARJEE

Abstract: A field experiment was conducted in the farmer\'s field site at Kalyani, West Bengal during summer season of 2002-03 to find out the efficacy of IR 5878 50 WG, a new herbicide molecule, to control the weeds in transplanted summer rice. It was found from the experiment that the new herbicide caused toxicity to the weeds earlier than that by the 2.4 D EE, butachlor, pretilachlor, anilophos. The new herbicide, IR 5878 at 150 g ha-1 recorded the highest WCE (5Y, 1%) followed by the traditional herbicides 2,4DEE and anilofos at harvest (53.9%). In the Initial stage of the herbicide application in some pockets of the experimental plots particularly where IR 5878 were applied at higher doses (125 or 150 g ha-1) caused stunted growth of paddy and these affected plants recovered within 21 days after application. IR 5878 at125 g ha-1 recorded the highest grain yield (8.29 t ha.1 ) among all the treatments used in this experiment which was 42.2 % more than that recorded from the untreated control, the lowest recorder (5.83 t ha-1) which was closely followed by the treatment, anilofos resulting 40.1% higher grain yield than the untreated control.

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