Essential oils of seven species were investigated in order to control peanut plants against white mold
(Sclerotium rolfsii Sacc.). The assays were carried out by in vitro and in vivo assays. At first,
fungitoxicity and suppression of oxalic acid diffusion (SOAD) bioassays were performed in order to
evaluate the mycelial growth of fungus. Then, validation assays were carried out in greenhouse,
involving inoculation of fungus in the seeds and further plant treatments with essential oil. Four isolates
of S. rolfsii were tested in different oil concentrations. Cymbopogon martinii oil at 300 ppm inhibited the
mycelia growth of S. rolfsii in 55% and also the number of sclerotia. In validation assay, we found that a
single dose of C. martinii oil at 400 ppm reduced the rate of disease in 55%, confirming the in vitro
assays. The follows traits: number of pods/plant, pod weight and harvest index increased in 57, 54, and
40%, respectively, in all C. martini oil treatments. These results demonstrate that C. martinii oil at low
concentration may serve for new formulations in the treatment and prevention of white mold.
Essential oils of seven species were investigated in order to control peanut plants against white mold(Sclerotium rolfsii Sacc.). The assays were carried out by in vitro and in vivo assays. At first,fungitoxicity and suppression of oxalic acid diffusion (SOAD) bioassays were performed in order toevaluate the mycelial growth of fungus. Then, validation assays were carried out in greenhouse,involving inoculation of fungus in the seeds and further plant treatments with essential oil. Four isolatesof S. rolfsii were tested in different oil concentrations. Cymbopogon martinii oil at 300 ppm inhibited themycelia growth of S. rolfsii in 55% and also the number of sclerotia. In validation assay, we found that asingle dose of C. martinii oil at 400 ppm reduced the rate of disease in 55%, confirming the in vitroassays. The follows traits: number of pods/plant, pod weight and harvest index increased in 57, 54, and40%, respectively, in all C. martini oil treatments. These results demonstrate that C. martinii oil at lowconcentration may serve for new formulations in the treatment and prevention of white mold.
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