ORIGINAL ARTICLE
Effect of fungicides on colony growth of Colletotrichum lindemuthianum (Sacc. & Magn.) Scrib.
 
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UNESP – Paulista State University, Faculty of Agronomy Department of Crop Production P.O. Box 237, 186.03-970 Botucatu, State of São Paulo, Brazil
CORRESPONDING AUTHOR
Maringoni Antonio Carlos
UNESP – Paulista State University, Faculty of Agronomy Department of Crop Production P.O. Box 237, 186.03-970 Botucatu, State of São Paulo, Brazil
 
Journal of Plant Protection Research 2008;48(2):201–212
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ABSTRACT
Colletotrichum lindemuthianum (Sacc. & Magn.) Scrib. is the causal agent of the anthracnose of common bean (Phaseolus vulgaris L.), a fungal disease of a great significance in brazilian bean cultures. The goals of this work were to evaluate the in vitro colony growth and to determine the ED50 interval of twenty C. lindemuthianum isolates from different regions of Brazil to five fungicides of different active ingredients and to some blendings (carbendazim, chlorothalonil, thiophanate-methyl, chlorothalonil + thiophanate-methyl, trifloxystrobin, propiconazole and trifloxystrobin + propiconazole), at concentrations of 0, 1, 10, 100 and 1 000 μg/ml, in a potato-dextrose-agar culture medium. The results revealed seven isolates with low sensitivity to carbendazim and thiophanate-methyl (ED50 interval greater than 1000 μg/ml) thus suggesting cross-resistance. Isolate sensitivity to chlorothalonil ranged from ED50 interval less than 1 μg/ml to greater than 1 000 μg/ml. Those isolates with high sensitivity to thiophanate-methyl, ED50 interval less than 1 μg/ml, did also show it with respect to chlorothalonil + thiophanate-methyl. Sixteen isolates showed a high sensitivity to trifloxystrobin with a ED50 interval less than 1 μg/ml. Nineteen isolates of C. lindemuthianum showed high sensitivity to propiconazole and to trifloxystrobin + propiconazole with ED50 interval less than 1 μg/ml. Isolates with low sensitivity to carbendazim and thiophanate-methyl were sensitive to propiconazole and to trifloxystrobin + propiconazole. Variability was found in the sensitivity of the colony growth of C. lindemuthianum isolates from different regions of Brazil to the fungicides evaluated.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
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