Abstract
Black rot of pineapple caused by the fungus Chalara paradoxa is considered an aggressive and difficult disease to control. The use of natural products has been studied with the goal to incorporate them into integrated pest management and reduce the use of agrochemicals. Plant extracts have shown satisfactory results in controlling postharvest diseases by providing fungitoxic action and inducing plant resistance. The aim of this study was to evaluate C. paradoxa severity by the application of plant extract of Mormodica charantia, determinate effect of the plant extract on post-harvest quality, and induction of enzymes linked to host resistance induction. The following treatments were studied: plant extract of bitter melon at concentrations of 10, 100, 500 and 1000 ppm, the commercial products acibenzolar-S–Methyl and fungicide (thiabendazole) in the dosages recommended by the manufacturers, and distilled water as the control, with five replications and two plants per plot. The extract of M. charantia reduced the severity of black rot caused by C. paradoxa, compared to the control treatment, showing similar efficacy to the treatments with commercial inductor Acibenzolar-S-methyl and the fungicide. The enzymatic analysis showed increase of the peroxidase by the use of the bitter melon extract along the evaluation period. The enzymes polyphenol oxidase and phenylalanine ammonia lyase showed greater activity by treatment with M. charantia extract at 500 ppm. It was observed that the plant extract did not affect most of the variables analyzed related to postharvest quality of treated fruits. The use of the extract reduced the fruit weight loss, being a positive aspect under the studied conditions.
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The authors acknowledge the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support made available for research and Laboratório de Biomassa CCA- UFPB by help us in experiments.
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de Souza, W.C.O., do Nascimento, L.C., Vieira, D.L. et al. Alternative control of Chalara paradoxa, causal agent of black rot of pineapple by plant extract of Mormodica charantia . Eur J Plant Pathol 142, 481–488 (2015). https://doi.org/10.1007/s10658-015-0627-6
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DOI: https://doi.org/10.1007/s10658-015-0627-6