Red rice chemical control in irrigated rice

Red rice (Oryza spp.) reduces rice (Oryza sativa L.) grain yield and quality. A field study was conducted to compare two red rice control tools, the first using the Clearfield (TM) system and the second using high rates of clomazone and rice seeds treated with safener to suppress red rice emergence. The treatments included: check control without herbicide application, three treatments for the formulated herbicide mixture (imazethapyr 75 g i.a. L-1 + imazapic 25 g i.a. L-1) under the Clearfield system, and three clomazone treatments (clomazone 500 g i.a. L-1). The most efficient treatment for red rice control was the formulated mixture of imazethapyr + imazapic (0.7 L ha(-1) PRE followed by 0.7 L ha(-1) POST). This treatment promoted 100% red rice control, without affecting plant stand and promoting high grain yield.