%0 Journal Article
%T Deriva simulada do glyphosate em cultivares de caf¨¦ Acai¨¢ e Catuca¨ª Simulated glyphosate drift on Acai¨¢ and Catuca¨ª coffee cultivars
%A A.C. Fran£¿a
%A F.P. Carvalho
%A C.M.T. Fialho
%A L. D'Antonino
%J Planta Daninha
%D 2013
%I Sociedade Brasileira da Ci¨ºncia das Plantas Daninhas
%X O objetivo desta pesquisa foi avaliar os efeitos da deriva simulada de glyphosate sobre o crescimento inicial de dois cultivares de caf¨¦ de crescimento distinto. Utilizou-se o delineamento em blocos casualizados com quatro repeti  es, sendo os tratamentos distribu¨ªdos em esquema fatorial 2x5. No primeiro fator foram alocados os cultivares e, no segundo, as subdoses do glyphosate (0, 57,6; 115,2; 230,4; e 460,8 g ha-1). No dia da aplica  o e tamb¨¦m aos 45 e 120 dias ap¨®s aplica  o (DAA), avaliaram-se a altura, a ¨¢rea foliar, o diametro do caule, o n¨²mero de ramos plagiotr¨®picos e de folhas; aos 10, 45 e 120 DAA foram avaliados os sintomas de intoxica  o nas plantas e, aos 120 DAA, o ac¨²mulo de massa seca de caule, folhas e ra¨ªzes. Os sintomas de intoxica  o nas plantas de caf¨¦ causados pelo glyphosate foram caracterizados por clorose e estreitamento do limbo foliar nos dois cultivares estudados. Todavia, sintomas mais severos foram verificados no cultivar Acai¨¢ a partir de 10 DAA, como necrose de folhas mais novas da parte mediana da planta. Conclui-se que o cultivar Acai¨¢ ¨¦ menos tolerante ao glyphosate, quando comparado ao Catuca¨ª, pois apresentou menor crescimento que o Catuca¨ª quando submetidos ao tratamento com o herbicida, ou seja, pode ocorrer tolerancia diferencial entre cultivares de crescimento distinto. This study aimed to evaluate the effects of simulated glyphosate drift on the growth of two cultivars with distinct growing patterns. The experiment was arranged in a randomized block design, with four repetitions, and the treatments were distributed in a factorial scheme 2x5, with two cultivars in the first factor and the glyphosate subdoses (0, 57.6; 115.2; 230.4 and 460.8 g ha 1) in the second factor. On the day glyphosate was applied and at 45 and 120 days after application (DAA), height, leaf area, stem diameter, and number of plagiotropic branches and leaves were evaluated; at 10, 45 and 120 DAA, plant intoxication symptoms were visually evaluated and at 120 DAA, dry mass accumulation of the stem, leaves, and roots was evaluated. The intoxication symptoms of the coffee plants caused by glyphosate were characterized by chlorosis and leaf narrowing in the two cultivars studied. However, more severe symptoms were verified in the Acai¨¢ cultivars from 10 DAA on, such as necrosis of younger leaves in the median part of the plant. It was concluded that Acai¨¢ cultivar is less tolerant to glyphosate than Catuca¨ª cultivar, since it showed lower growth when submitted to herbicide treatment, i.e., tolerance can vary between cultivars with distinct gr
%K Coffea arabica
%K herbicida
%K EPSPs
%K Coffea arabica
%K herbicide
%K EPSPs
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200023