Revista Brasileira De Herbicidas 2002; 3(1): 51-56
Efficacy and selectivity of cloransulam-methyl in postemergence control of weeds in soybean
DOI: 10.7824/rbh.v3i1.372
An experiment was carried out on a “Cerrado” oxisol with a loamy texture during 1996/97. The objective of present work was to evaluate the selectivity and efficacy of cloransulam-methyl, alone or tank mixed with lactofen, applied postemergence on soybean (cv. Doko) in controlling broadleafweeds. The experimental design was a complete randomized block with seven treatrnents and four replications. The treatrnents were: cloransulam-methyl (20, 30 and 40 g/ha), chloransulammethyl+ lactofen (30+96 glha), chlorimuron-ethyl+lactofen (12.5+96.0 g/ha) and control with and without weeds. Cloransulammethyl, independent ofthe used dose, provided efficient control of Aeanthospermun hispidum and Blainvillea latifolia and in mixture with lactofen presented efficient control of Nieandra physaloides. The tank misture chlorimuron-ethyl+lactofen presented efficient control of Aeanthospermun hispidum, Blainvillea latifolia and Nieandra physaloides. Significant differences were not observed among the productivity with the chemical treatrnents, but reduced productivity ofthe control without weed cIearance and with lower dose of cloransulam-methyl in 48% and 35% in relation to the weed free control, respectively. The application of the treatrnents did not affect significantly the initial and final population, height of the plant and nor height of insert of the first bean. The index of mechanical harvesting with the chemical treatrnents was excellent, except for plots which received cloransulam-rnethyl at 20 glha. All the tested treatments were selective for soybean.
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