Abstract
Field experiments were conducted during two cropping seasons in southeastern Botswana to investigate the efficacy of postemergence graminicides in controlling Cynodon dactylon in sunflower ( Helianthus annuus L.). Treatments consisted of haloxyfop applied at 1.08 and 2.16, fluazifop-p at 0.250 and 0.500, and sethoxydim at 0.150 and 0.300 kg ha −1 plus handweeded and unweeded controls. In 1998, haloxyfop and fluazifop-p applied at high rates reduced C. dactylon shoot dry weight by 80, and 59%, respectively; however, in 1999 they reduced grass shoot dry weight by 77 and 86%, respectively. Sethoxydim was less effective in controlling the perennial grass than haloxyfop and fluazifop-p. Visual assessment indicated that fluazifop-p and haloxyfop provided satisfactory grass control after a single application. Postemergence herbicides offer good weed control on fragile soils in a semi-arid environment.
Published Version
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