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Antibacterial activity of essential oils on Xanthomonas vesicatoria and control of bacterial spot in tomato PAB
Lucas,Gilvaine Ciavareli; Alves,Eduardo; Pereira,Ricardo Borges; Perina,Fabiano José; Souza,Ricardo Magela de.
The objective of this work was to evaluate the effects of plant essential oils (EOs) on the growth of Xanthomonas vesicatoria, on bacterial morphology and ultrastructure, and on the severity of tomato bacterial spot. EOs from citronella, clove, cinnamon, lemongrass, eucalyptus, thyme, and tea tree were evaluated in vitro at concentrations of 0.1, 1.0, 10, and 100% in 1.0% powdered milk. The effect of EOs, at 0.1%, on the severity of tomato bacterial spot was evaluated in tomato seedlings under greenhouse conditions. The effects of citronella, lemongrass, clove, and tea tree EOs, at 0.1%, on X. vesicatoria cells were evaluated by transmission electron microscopy. All EOs showed direct toxic effect on the bacteria at a 10%-concentration in vitro. Under...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alternative control of plant disease; Cell ultrastructure; Pathogenic bacteria.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000300006
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Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils Ciência e Agrotecnologia
Hoyos,Julián Mauricio Ágredo; Alves,Eduardo; Rozwalka,Luciane Cristina; Souza,Elaine Aparecida de; Zeviani,Walmes Marques.
Pseudocercospora griseola, the etiologic agent of angular leaf spot of common bean (Phaseolus vulgaris), is an important disease in all bean-producing regions worldwide and may cause extremely high yield losses. The control of this disease is made more difficult by the pathogen's genetic variability and the inefficiency of fungicides. In this study, of 26 essential oils tested at different concentrations, 25 demonstrated efficiency in affecting the germination of strains 63-31 and 63-63 of the pathogen, reaching inhibition levels of between 80% and 100%. Cymbopogon citratus and Cymbopogon martinii inhibited conidia germination at all concentrations; Eugenia caryophyllata, Cinnamomum sp., Thymus vulgaris, Matricaria recutita, Cordia verbenacea, Origanum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Angular leaf spot; Transmission electron microscopy; Alternative control of plant disease.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000300002
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Citronella essential oil in the control and activation of coffee plants defense response against rust and brown eye spot Ciência e Agrotecnologia
Pereira,Ricardo Borges; Lucas,Gilvaine Ciavareli; Perina,Fabiano José; Ribeiro Júnior,Pedro Martins; Alves,Eduardo.
The rust and brown eye spot are the main coffee diseases. The losses are due to intense defoliation of plants, which has reduced its production and longevity. The brown eye spot also occurs in fruits, with negative effects on the beverage quality. Some essential oils have presented promising results in the control of plant diseases, as an alternative to the use of fungicides. The objective of this study was to evaluate citronella essential oil in the control of rust and brown eye spot and in the activation of coffee plants defense responses. Twelve-month-old plants were sprayed with citronella oil 1000 µL L-1, acibenzolar-S-methyl 200 mg L-1 and tebuconazole fungicide 200 mg L-1. Plants were inoculated with Hemileia vastatrix and Cercospora coffeicola...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemileia vastatrix; Cercospora coffeicola; Cymbopogon nardus; Induced resistance; Alternative control of plant disease.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400001
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