<p>Weed control is fundamental in coffee cultivation due to their high interference, competing with the crop for water, light and nutrients. Among the control methods used, chemical control is highlighted, due to its high efficiency and low cost. However, due to application failures, herbicide drift phytotoxicity is common. Aiming at the search for selective active ingredients in coffee, the objective of this study was to evaluate the selectivity of the active ingredient Glyphosate in young coffee plants. The experiment was carried out in a greenhouse with ‘Topázio MG1190’ coffee plants (<em>Coffea arabica</em> L.), cultivated in pots with an 11 L-substrate capacity. The statistical design was RBD, with four replications and four doses of the herbicide, making up 16 experimental plots. Each plot consisted of three plants. The treatments were: (i) 0%; (ii) 10%; (iii) 25% and (iv) 50% of the commercial dose of the herbicide Glyphosate. The evaluations were performed at 104 days after application of the treatments. Growth, morphological, physiological and anatomical characteristics were evaluated. The collected data were analyzed using the SISVAR software. The effect of glyphosate drift impairs plant growth. However, after 104 days of intoxication, there is no longer any effect on the physiology and leaf anatomy of coffee trees.</p>

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The goal of our work was to evaluate physiological and agronomic traits, as well as the relationship between these traits in coffee cultivars coming from a germplasm supposedly resistant to leaf rust, and their response to framework pruning. The experiment was conducted at the Federal University of Lavras in randomized blocks with three replicates, with spacing of 3.5 x 0.7 m and plots of 12 plants. An amount of 25 coffee cultivars was evaluated, from which 23 were considered resistant and two susceptible to leaf rust. Traits analyzed were the plagiotropic branch length and number of nodes, net photosynthetic rate, transpiration rate, water use efficiency, fluorescence and chlorophyll index, leaf area index, leaf rust incidence and yield. Catucaí Amarelo 20/15 cv 479, Araponga MG1 and Tupi IAC 1669-33 cultivars show highly responsive to framework pruning. These cultivars have high yield associated to high net photosynthetic rate, water use efficiency and low transpiration rate. Moreover, the last two cultivars show a low incidence of leaf rust. The Acauã cultivar has a good response to framework pruning, showing high yield associated to lower incidence of leaf rust. Catucaí Vermelho 785/15 cultivar is not responsive to framework pruning because show lower yield, high incidence of leaf rust, low vegetative growth and low water use efficiency.

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A introdução de métodos que permitem a clonagem do cafeeiro pode ser útil em programas de melhoramento genético e até mesmo para a produção comercial de mudas. Entre os métodos de propagação vegetativa, a estaquia tem possibilitado melhores resultados, no entanto, um dos entraves para a produção em escala comercial é a quantidade reduzida de ramos ortotrópicos produzidos pela planta matriz. Uma alternativa seria a utilização de miniestaquia, a qual é amplamente usada na produção de mudas de eucalipto. Objetivou-se com este trabalho estudar o emprego da técnica de miniestaquia na formação de mudas clonais de Coffea arabica L. em diferentes volumes de tubetes. Foram avaliados cinco tipos de miniestacas oriundas de diferentes porções do ramo ortotrópico (apical, semiapical, intermediária, semibasal e basal) e dois volumes de tubete (50 e 120 cm³). O experimento foi implantado em um delineamento inteiramente casualizado disposto em um esquema fatorial 5 x 2, com quatro repetições. Foram observadas diferenças apenas entre os tipos de miniestacas oriundas das diferentes porções dos ramos ortotrópicos. As miniestacas das porções semiapical, intermediárias e semibasal dos ramos ortotrópicos promovem melhor crescimento das mudas clonais de cafeeiros, independentemente do volume do tubete utilizado.