Chemical control of siam weed (Chromolaena odorata)
1989
Pornchai Lueang-a-papong (Chiang Mai Univ., Chiang Mai (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Experiments were conducted to study the efficacy of certain postemergence herbicides on siam weed (Chromolaena odorata) in southern Thailand. The herbicides were treated as foliage applied to siam weed of 1.5-2.0 m in heigh with knapsack sprayer in the spray volume of 500 L/h. Visual assessment was undertaken to evaluate percentage control after application. It was found that both Fluroxypyr (4-amino-3, 5-dichloro-6-fluoro-2-pyridyloxyacetic acid) and Triclopyr (3,5,6-trichloro-2-pyridyloxyloxyacetic acid) gave a quite good control of siam weed. Fluroxypyr showed faster and better effect on siam weed than Triclopyr. The optimum rate of Fluroxypyr for acceptable siam weed control was 175-200 g(ae)/ha. Triclopyr was found to be effective when applied at the rate of 300-350 g (ae)/ha.
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