Bioefficacy and phytotoxicity of herbicides in greengram and their residual effect on succeeding mustard

Weed flora of experimental field was dominated with Echinochloa colona during Kharif 2012 and Trianthema portulacastrum during Kharif 2013. Post-emergence application of imazethapyr at 70 g/ha and its ready mixture with imazamox at 60–80 g/ha although provided excellent (80–90%) control of weeds but caused 23–35% injury to greengram in initial stages in terms of yellowing of leaves and stunted crop growth up to 7 DAT which mitigated to 5–7% up to 45 DAS, without any yield reductions. Pre-emergence application of pendimethalin+ imazethapyr (ready mix) at 1000 g/ha provided season long control (7582%) of weeds in greengram. During both years, seed yield was maximum (1.50 and 1.58 t/ha, respectively) in weed free treatment which was at par with post-emergence application of imazethapyr at 50 and 70 g/ha and imazethapyr + imazamox (ready mix) at 60 g/ha in 2012 but significantly higher than all herbicide treatments in 2013. Imazethapyr and its ready mix combination irrespective of dose did not cause any injury to succeeding mustard crop after harvest of greengram.