Evaluation of Dithiopyr Alone and in Combination with Trifluralin for the Control of Weeds in Wheat

Dithiopyr at 360 g ha⁻¹ proved superior in reducing the density of Phalaris minor than the lower doses and was at par with trifluralin at 1250 g ha⁻¹ and isoproturon at 1000 g ha⁻¹. Density of broad leaf weeds was significantly lower in the plots treated with dithiopyr at 240 g ha⁻¹ compared to trifluralin at 1250 g ha⁻¹. Tank mixture of dithiopyr+isoproturon at 120+ 1000 g ha⁻¹ reduced the total dry weight of weeds by more than 90% over weedy check and provided similar yield to that of isoproturon and weed-free treatment. It was observed that at higher dose (480 g ha⁻¹) of dithiopyr crop lodged due to thin stem and increased length of internodes.