To study the bioefficacy and phytotoxicity of new herbicide pinoxaden against isoproturon resistant population of Phalaris minor in wheat and its residual effect on succeeding rice and sorghum crops, field experiments were conducted at Chaudhary Charan Singh Haryana Agricultural University, Hisar during winter season of 2005 and 2006 and at Barhi (Ambala) and Chanarthal (Kurukshetra) during rabi 2007-08 and 2008-09. Little seed canary grass (Phalaris minor Retz.), the dominant grassy weed was very effectively controlled by post emergence (35 DAS) application of pinoxaden at 45-50 g/ha. At Hisar, pinoxaden at 45 g/ha provided 98.7 and 100% control of P. minor during 2005 and 2006, respectively, which was at par with clodinafop at 60 g/ha and sulfosulfuron and better than the performance of fenoxaprop. Grain yield of wheat with use of pinoxaden at 45 g/ha was 4450 and 4650 kg/ha during first and second year of experimentation, which was significantly higher than its lower doses of 35 and 40 g/ha but statistically at par with its higher dose of 50g/ha and already recommended herbicides clodinafop-propargyl and sulfosulfuron. Post emergence use of pinoxaden at 50 g/ha was able to control clodinafop resistant population of P. minor at farmers fields in Barhi (Ambala) and Chanarthal ( Kurukshetra). Results of 13 and 20 on farm trials conducted during 2007-08 and 2008-09,respectively in various districts of state revealed that pinoxaden at 50 g/ha gave 10.6 and 9.6% higher grain yield over recommended clodinafop at 60 g/ha. No carry over effect of this herbicide at any of doses tested was observed on succeeding sorghum and rice crops grown in succession after wheat