Management of herbicide resistant Phalaris minor through sequential application of pre- and post-emergence herbicides in wheat

A field study was conducted during winter season of 2017–18 at Department of Agronomy, CCS Haryana Agricultural University, Hisar under irrigated conditions to evaluate the management of P. minor through sequential application of pre-emergence (PE) and post-emergence (PoE) herbicide in wheat crop and their phytotoxic effect on the succeeding crop. Total fifteen treatments consisting of pre-emergence (PE) use of pendimethalin 1500 g/ha, clodinafop 60 and 120 g/ha (35 DAS), sulfosulfuron 25 g/ha (35 DAS), sulfosulfuron + metsulfuron 32 g/ha (35 DAS), pinoxaden 50 g/ha (35 DAS), mesosulfuron + iodosulfuron (RM) 14.4 g/ha (35 DAS), PE of pendimethalin + metribuzin (RM) 2000 g/ha, PE pendimethalin + metribuzin (RM) fb clodinafop 60 g/ha (35 DAS), PE pendimethalin + metribuzin (RM) fb sulfosulfuron 25 g/ha (35 DAS), PE pendimethalin + metribuzin (RM) fb sulfosulfuron + metsulfuron 32 g/ha(35 DAS), PE pendimethalin + metribuzin (RM) fb pinoxaden 50 g/ha (35 DAS), PE pendimethalin + metribuzin (RM) fb mesosulfuron + iodosulfuron (RM) 14.4 g/ha (35 DAS), weedy check and weed free were take. The results of present study revealed that PE followed by PoE herbicides are effective for the control of resistant P. minor population. The sequential application of PE pendimethalin + metribuzin (RM) 2000 g/ha fb mesosulfuron + iodosulfuron (RM) 14.4 g/ha followed by PE pendimethalin + metribuzin (RM) 2000 g/ha fb sulfosulfuron + metsulfuron (RM) 32 g/ha and pinoxaden 50 g/ha were the most effective for control of resistant P. minor compared to alone PE or PoE herbicide. Grain yield and economics were also higher with these treatments.