Abstract
An experiment was conducted to evaluate the bio-efficacy of several herbicide treatments and a manual slashing treatment to control the shrub plant Baeckea frutescens in oil palm plantation. The present trial comprised of two rates of paraquat, one rate of paraquat + metsulfuron-methyl mixture, two rates of glyphosate, one rate of glyphosate + metsulfuron-methyl mixture, and one rate each for both metsulfuron-methyl and triclopyr. Fast control was observed in paraquat and paraquat+ metsulfuron-methyl mixture treatments. However, the control was not long due to weed regeneration. Both the metsulfuron-methyl and triclopyr treatments were observed to give similar good control. In general, glyphosate at the lower and higher rates as well as its mixture with metsulfuron-methyl gave effective control. The final results at 12 weeks after spraying showed that the most cost effective treatment is the mixture of 1.5 L glyphosate + 75 g metsulfuron-methyl per hectare. Keywords: Baeckea frutescens, weed control, herbicides.
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