sensibilidade de colletotrichum gloeosporioides (mancha manteigosa do cafeeiro) a diferentes concentrações de fungicidas sensibility of colletotrichum gloeosporioides (coffee blister spot) to different fungicide concentrations

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ID: 258958
2009
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Abstract
Com o objetivo de avaliar a eficiência de alguns fungicidas sobre Colletotrichum gloeosporioides, agente etiológico da mancha manteigosa do cafeeiro (Coffea arabica L.), testes in vitro foram conduzidos no Laboratório de Diagnose e Controle/UFLA. Utilizou-se o método de incorporação de fungicidas ao meio de cultura MEA 2% para a avaliação da inibição do crescimento micelial e em lâmina escavada contendo água com fungicida para a germinação de conídios. Os fungicidas, tetraconazol, triadimenol, chlorotalonil e mancozeb foram testados quanto à inibição do crescimento do micelial (nas concentrações de 1, 5, 10, 25, 50, 100, 500 e 1.000 mg L-1) e quanto à inibição da germinação de conídios (nas concentrações de 1, 5, 10, 25, 50 e 100 mg L-1). Os fungicidas tetraconazol e triadimenol apresentaram alta eficiência na inibição do crescimento micelial. Os fungicidas chlorotalonil e mancozeb mostraram baixa eficiência e ineficiência, respectivamente. Quanto à germinação dos conídios, os fungicidas que demonstraram maior eficiência em baixas concentrações foram o chlorotalonil e o tetraconazol.
With the aim of assessing the effect of selected fungicides on Colletotrichum gloeosporioides, the cause of coffee blister spot, in vitro tests were carried out in the Laboratory of Diagnosis and Control/UFLA, Federal University of Lavras, Brazil. In the in vitro experiments the fungicides were incorporated into malt extract medium (MEA 2%) to evaluate the effect on the fungus growth rate, and concavity slides containing water plus fungicide to assess the conidia germination. The fungicides tetraconazol, triadimenol, chlorothalonil and mancozeb were tested on the mycelial growth inhibition (in the concentrations of 1, 5, 10, 25, 50, 100, 500 and 1.000 mg L-1) and on the inhibition conidia germination (in the concentrations of 1, 5, 10, 25, 50 e 100 mg L-1). The fungicides tetraconazol and triadimenol showed high efficiency on the mycelial growth inhibition. Chlorotalonil and mancozeb showed low efficiency and inefficiency, respectively. As to the germination of conidia, chlorothalonil and tetraconazol demonstrated to be more efficient in low concentrations.
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Authors ;Josimar Batista Ferreira;Mario Sobral de Abreu;Igor Souza Pereira;Katiucia Dias Fernandes;Ricardo Borges Pereira
Journal information and software technology
Year 2009
DOI
10.1590/S1413-70542009000700059
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000700059
Keywords
coffea arabica

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