Resumo

VISINTIN, Griselda; GIECO, Ileana; GARCIA, Blanca  e  FALICO, Ladys. Native Microorganism Bioactivity in Oranges Infected by Penicillium digitatum Resistant and Sensitive to Fungicide. Cienc. docencia tecnol. [online]. 2007, n.34, pp.229-242. ISSN 1851-1716.

The objective of this work was to evaluate the effect of local microorganisms on suppressing rots caused by Penicillium digitatum in Valencia Late oranges. Oranges at commercial maturity were inoculated with 40 μl of microbial suspension (10⁷-10⁸ ufc/ml) to each wound. After two hours, 20 μl of a suspension (3,8 x 10⁶ con/ml) of fungicide sensitive or resistant Penicillium were applied. The oranges were incubated for eight days under laboratory conditions, using CAD of five treatments with 25 fruits and four repetitions. The accumulated incidence of rotten fruits was registered; the infection rates, adjusting the disease progress curves to mathematical models, and the efficacy rates for each treatment were obtained. The bioactive capacity of evaluated microorganisms was higher in the sensitive to fungicide Penicillium strain. Within native micoorganisms, CNOV1 a bacterium isolated from orange phyllosphere was the most effective showing the lowest incidence of symptomatic fruits as well as the lowest infection rates in Valencia Late oranges.

Palavras-chave : Biocontrol; Postharvest rots; Penicillium digitatum; Citrus sinensis.

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