The objective of this research was to evaluate the selectivity of halosulfuron alone and in mixture with glyphosate sprayed on pre and post emergence on summer crops soybean, corn, bean, cotton and for winter crops black oats, ryegrass, rye, wheat and X Triticosacale. Two experiments were carried out at Experimental Station and São Manuel - UNESP - Botucatu-SP - Brazil. The treatments consisted of halosulfuron herbicide (100/150 g ha-1 ) on pre and post emergence application, and in tank mix of halosulfuron+glyphosate NA and WG (100+4000 g ha¹) respectively on pre emergence application and in different timings: 2, 15 and 30 days before and 15 and 30 days after crop seeding . The phytotoxicity in soybean, corn, bean, cotton and ryegrass plants was due to application of halosulfuron which has been related to rates, seasons and mode of application . The higher the rates of halosulfuron application to post emergence of the crops, the higher was the injury found in the plants. All treatments did not injured oat, rye, wheat and X Triticosecale plants.
herbicides; sufonylureas; phytotoxicity
