Jicama [Pachyrhizus erosus (L.) Urban] is a species recently introduced to Venezuela and is a possible alternative for human and animal food because of its high yields and nutritional value, among other reasons. To evaluate the effect of weeds and their control on yield of tuberous roots of jicama (P. erosus), an experiment was conducted in the Experimental Station of the National Center of Agricultural Research, located 423 m above sea level in Maracay, Aragua, Venezuela, in 1996 to 1997 (November to May). The treatments evaluated were no weed control (control), control with manual labor cultivation (manual), and control by grazing sheep in an experimental area of 100 m2, with a density of 50,000 plants·ha-1. The statistical analysis was performed with an analysis of variance and the means were compared with the Duncan test. The results indicated that weed control with sheep increased root yields (36 t·ha-1), and weeds were controlled in the crop (12.9 % at the end of the cycle). It is concluded that sheep as weed controllers increased jicama yields by more than 15 %.