Reaction of hybrids, inhibition in vitro and target spot control in cucumber
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2011-09
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Resumo
The fungus Corynespora cassiicola is the causal agent of target
spot in cucumber. Under favorable climatic conditions it can cause
serious damage in this horticultural crop. In Brazil, there exists not
enough knowledge to determine efficient control measures to the
disease. This investigation was carried out to evaluate: a) the reactions
of nine cucumber hybrids to C. cassiicola; b) the sensibility of six
isolates of C. cassiicola to fungicides in vitro (captan, chlorothalonil,
mancozeb, azoxystrobin, difenoconazole, carbendazin, tebuconazole
and thiophanate-methyl), used in concentrations of 0, 1, 10, 100
and 1,000 μg mL -1 of active ingredient and c) protective and
curative chemical treatments with the same fungicides used in vitro
in cucumber plants inoculated with C. cassiicola. The cucumber
hybrids were evaluated using the scale of notes and diagrammatic of
target spot severity. The more resistant hybrids to the pathogen were
Taisho, Nikkey, Yoshinari and Safira. The difenoconazole fungicide
caused the most mycelial growth inhibition (MGI) and showed the
lowest ED 50 . Thiophanate-methyl was the worst fungicide, it did not
inhibit the mycelial growth of the fungus. Azoxystrobin was the most
efficient in controlling the disease, although it has to be registered in
Ministry of Agriculture, Livestock and Food Supply in Brazil before
its recommendation.
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Cucumis sativus, Genetic resistance, Corynespora cassiicola, Sensitivity to fungicides, Cucumis sativus, Resistência genética, Corynespora cassiicola, Sensibilidade a fungicidas
Citação
TERAMOTO, Adriana; MARTINS, Marise C.; FERREIRA, Luciene C.; CUNHA, Marcos G. Reaction of hybrids, inhibition in vitro and target spot control in cucumber. Horticultura Brasileira, Brasília, v. 29, n. 3, p. 342-348, July/Sept. 2011.