Management of Herbicide Resistant Biotypes of Phalaris minor in Wheat Growing Sub tropics of Jammu

Abstract

newline The present study entitled Management of Herbicide Resistant Biotypes of Phalaris minor in Wheat Growing Sub-tropics of Jammu was conducted at the Research Farm, Division of Agronomy, Faculty of Agriculture, SKUAST- J, Chatha during Rabi season of 2019-20 and 2020-21. The soil of the experimental site was sandy clay loam in texture, slightly alkaline in reaction, low in organic carbon and available nitrogen but medium in phosphorus and potassium. The pot experiment-I for identification of resistant biotypes at recommended herbicidal applications was laid out in completely randomized design with six treatments and four replications for twenty-five P. minor biotypes. The P. minor biotypes were evaluated against five recommended herbicides (isoproturon, sulfosulfuron, pinoxaden, clodinafop and fenoxaprop) with their graded doses (0, 1/4X, 1/2X, X (Recommended dose), 2X and 4X) i.e. isoproturon (0, 187.50, 375, 750, 1500 and 3000 g/ha.), sulfosulfuron (0, 6.25, 12.5, 25, 50 and 100 g/ha.), clodinafop (0, 15, 30, 60, 120 and 240 g/ha.), fenoxaprop (0, 25, 50, 100, 200 and 400 g/ha.) and pinoxaden (0, 10, 20, 40, 80, 160 g/ha.), respectively where total 3000 pots were used. Sunderbani, Rajouri biotype (33.413 N, 74.284 E, 580 m) was taken as susceptible. The field experiment II for management of resistant biotypes of P. minor in crop- weed association with alternative herbicidal options was laid out in randomized block design with eleven treatments and three replications for each three identified resistant P. minor biotypes. The treatments consisted of pre-emergence application of pendimethalin (1000 g/ha), pendimethalin + pyroxasulfone (910 g + 75 g/ha), pendimethalin + metribuzin (1000 g + 150 g/ha), post-emergence application of metribuzin + clodinafop (210 g + 60 g/ha), pinoxaden (40 g/ha), fenoxaprop (100 g/ha), clodinafop (60 g/ha), sulfosulfuron (25 g/ha), isoproturon (750 g/ha) along with weed free and weedy check for comparison. The recommended dose of NPK was applied in wheat crop through i