Revista Brasileira De Herbicidas 2005; 4(2): 13-16

ISSUE Cover

RATES OF METOLACHLOR IN COMMON BEAN (Phaseolus vulgaris L.) DEVELOPMENT

DOI: 10.7824/rbh.v4i2.20

In Brazil, the maize crop presents the biggest consumption of metolachlor herbicide; however, with the increase of winter beans cultivated area, this culture became an important market for this product. The work was developed in FCA/UNESP, Botucatu, SP, with objective to evaluate rates of the metolachlor herbicide in the common bean, being used cultivar FT Bonito, in winter season. the development stadiums V2, V3 and V4. The treatments had been constituted of five doses (0; 1,0; 2,0; 3,0; 4,0 and 5,0 L/ha) totalizing 6 treatments with 5 repetitions. The herbicide was applied in pre-emergency, being carried through the following evaluations in the stadio V2, V3 and V4, corresponding to the unfolding of primary leaves, emission of the first trifoliate leaf and emission of the third trifoliate leaf: height of plants; dry matter of shoot and symptoms of toxicity. It was verified that in relation to the height of plants in the V2 stadium was not verified significant difference. However, it was observed the occurrence symptoms of toxicity, that were more intense in the biggest rate of herbicide. Despite the reduction in the development of the plants in three development stadiums it did not have reduction in the production of dry matter.