Journal of Plant Protection Research (2008) 48, 201-212

Juliana Elisa Sartori and Antonio Carlos Maringoni (2008)
Effect of fungicides on colony growth of Colletotrichum lindemuthianum (Sacc. and Magn.) Scrib.
Journal of Plant Protection Research 48 (2), 201-212
Abstract: Colletotrichum lindemuthianum (Sacc. and 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.
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Database assignments for author(s): Antonio Carlos Maringoni

Research topic(s) for pests/diseases/weeds:
control - general
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Colletotrichum lindemuthianum	Beans (Phaseolus)	Brazil (south)