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Torpedograss (Panicum repens L.) is a serious rhizomatous perennial weed in sugarcane (Saccharum offacinarum L.) in Taiwan, Hawaii and Okinawa. Two experiments were conducted to investigate torpedo-grass control and sugarcane injury using 2, 3 and 4kg ai/ha of asulam (methyl sulfanilyl carbamate) based on the time of herbicide application in the early growth stage of sugarcane. The asulam formulations used were SL (soluble concentrate, 37%) and WG (water soluble granule, 80%). Each formulation was applied at 20 days after planting (DAP) in the first experiment, and at 40DAP in the other experiment. Asulam SL and WG at 2 to 4kg ai/ha gave 100% control of torpedograss when applied either at 20 or 40DAP. Asulam applied at 20 and 40DAP required about 28 and 35 days after treatment, respectively to control torpedograss completely. Higher growth, yield and yield parameters of sugarcane were obtained by the 20DAP application of both formulations at 2kg ai/ha than those at higher rates. The formulations at 4kg ai/ha applied at 20DAP had severe injury effects on growth, yield and yield parameters of sugarcane, while 2, 3 and 4kg ai/ha of the formulations applied at 40DAP caused no negative impact on sugarcane growth, yield or yield parameters. Yield of sugarcane was significantly increased by all examined rates of the two asulam formulations applied at 40DAP in comparison with those of untreated weedy crop cultivation. The results of these experiments suggest that both asulam formulations (SL and WG) at 2kg ai/ha would successfully control torpedograss in sugarcane by post emergence application within 20-40 days of planting.

Effect of Asulam on Sugarcane and Torpedograss(Panicum repens L.).