Efficacy of carfentrazone-ethyl and glyphosate mixtures on control of Commelina benghalensis in coffee crop (Coffea arabica)

Abstract

The objective of this research was to evaluate the efficacy in control of Commefina benghalensis using mixtures of carfentrazone-ethyl and glyphosate herbicides on the coffee crop. The experiment was carried out in São José Farm, Garça- SP, Brazil. The treatrnents were: postemergence application of carfentrazone-ethyl + glyphosate (10+ 1200, 15+ 1200,20+ 1200, 25+1200,30+1200,40+1200 and 50+1200 g/ha), 2,4-0 (2680 g/ha), glyphosate (1200 g/ha) and an untreated control. Experimental design was a randomized complete block with three replications. The carfentrazone-ethyl mixture with glyphosate herbicide was efficient in the control of Commelina benghalensis starting with doses greater than or equal to 30 g/ha. The maximum dose of carfentrazone-ethyl (50 g/ha) mixture and glyphosate herbicides were fully efficient in control of the weed, up to 15 days after application on the coffee crop. The glyphosate herbicide control on the weed species was more efficient, presenting a faster dessication period, when used with increasing doses of carfentrazone herbicide above 25 g/ha, when compared with glyphosate alone. The evaluated herbicides and mixtures did not present toxicity to the coffee leaves.