Abstract
Two field experiments were conducted to evaluate herbicides for chemical weed control in sweetpotato plantings at the Isabela and Fortuna, Agricultural Experiment Substations, located in the northwestern humid and southern dry coasts of Puerto Rico, respectively. Pre-emergence herbicides were sprayed on Miguela sweetpotato cultivar two days after planting on weedfree soil. Weed control ratings taken eight weeks after treatment application showed effective control with the use of diphenamid (N,N-dimethyl-2,2- diphenylacetamide) alone or in combination with chloramben (3-amino-2,5- dichlorobenzoic acid) or DCPA (dimethyl tetrachloroterephthalate). There was no visible crop injury. There was no significant difference in tuber yields among herbicidal treatments at the two locations. Yields of herbicide-treated plots were comparable to those obtained from the handweeded control at Fortuna.