Resumo

ANZALONE, Alvaro; ARIZALETA, Miguel  e  VARGAS, Jorge. Coffee plant (Coffea arabica var. ‘Catuaí’ response to glyphosate, clomazone, linuron, 2,4-D, metsulfuron-methyl, rimsulfuron and clorimuron-ethyl herbicides. Bioagro [online]. 2014, vol.26, n.1, pp.3-12. ISSN 1316-3361.

Young coffee plants are susceptible to interference of weeds, especially those located in the seed yarn, therefore, in control plantations should target the seed yarn maintenance weed free and this can be achieved the use of herbicides. In order to evaluate the response of coffee to the application of different herbicides, two trials were conducted. The variables evaluated were number of leaves, level of damage, plant height and fresh biomass which is assessed using dose-response curves. For test A, doses applied were X, 0.5X, 0.25X, 0.125X, where X is the commercial dose of the herbicide in g·ha^{-1 a}.i. (1920 for glyphosate, 360 clomazone, 1500 for linuron, 360 for 2,4-D amine, 12.5 for metsulfuron-methyl, 30 for rimsulfuron, and 30 for chlorimuron-ethyl). For assay B, chlorimuron-ethyl was used as the herbicide showed higher coffee selectivity in Test A, in doses of 1.25X 1.5X 1.75X and 2X. Test results A, showed that the chlorimuron-ethyl had the best performance in terms of the variables evaluated, followed by rimsulfuron. Glyphosate caused a damage level 20 to level ALAM, up to doses of 960 g·ha^-1 a.i. The linuron and 2,4-D amine produced a very high damage on plants. The clomazone and metsulfuron-methyl had an intermediate behavior regarding damage to plants. Glyphosate, linuron and 2,4-D (amine) were herbicides that it was possible to find a log-logistic significant dose-response model. In test B, 37.5 g·ha^-1 a.i. of chlorimuron-ethyl was an index of 10 according the damage scale used^.

Palavras-chave : Selectivity; dose-response; weeds.

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