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Registros recuperados: 7
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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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Ativação de defesa em cacaueiro contra a murcha-de-verticílio por extratos naturais e acibenzolar-S-metil PAB
Pereira,Ricardo Borges; Resende,Mário Lúcio Vilela de; Ribeiro Júnior,Pedro Martins; Amaral,Daniel Rufino; Lucas,Gilvaine Ciavareli; Cavalcanti,Fábio Rossi.
O objetivo deste trabalho foi avaliar o potencial de extratos fúngicos e vegetais na redução da murcha-de-verticílio do cacaueiro, as atividades da peroxidase e polifenoloxidase e o conteúdo de lignina. Mudas de cacaueiro foram pulverizadas com filtrado de micélio de Rhizopus sp. (FMR), quitosana de Rhizopus sp. (QMR) e Trichoderma sp. (QMT), extratos de casca in natura e seca de maracujá, extrato metanólico de casca seca de frutos de maracujá (MMS) e acibenzolar-S-metil (ASM - 0.2 mg mL-1) e sete dias depois, submetidas à inoculação de Verticillium dahliae. O ASM reduziu a murcha-de-verticílio em 38,0%, seguido dos extratos FMR, QMT, MMS e QMR, que apresentaram reduções em 22,8, 20,1, 19,2 e 15,7%, respectivamente, em relação à testemunha. Plantas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Theobroma cacao; Verticillium dahliae; Lignina; Peroxidase; Polifenoloxidase.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000200003
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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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Essential oils and whole milk in the control of soybean powdery mildew Ciência Rural
Perina,Fabiano José; Alves,Eduardo; Pereira,Ricardo Borges; Lucas,Gilvaine Ciavareli; Labory,Claudia Regina Gontijo; Castro,Hilário Antonio de.
This research aimed to evaluate the potential of essential oils (EOs) and cow's whole milk (CWM) in order to control soybean powdery mildew and to estimate the most effective concentrations of these natural products in reducing the disease severity on soybean plants. Three experiments were carried out: The first experiment evaluated and selected the most effective treatments to reduce the severity of soybean powdery mildew under greenhouse conditions; the second experiment evaluated the effect of CWM and EOs of citronella, lemongrass, eucalyptus, cinnamon and tea tree on the pathogen through the ultrastructure analysis of soybean leaflets infected by Erysiphe diffusa using the scanning electron microscope (SEM) and light microscope (LM) technology. In the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Erysiphe diffusa; Glycine max; Essential oil as biocontrol; Scanning electron microscopy; Effective concentrations.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013001100003
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Essential oils for rust control on coffee plants Ciência e Agrotecnologia
Pereira,Ricardo Borges; Lucas,Gilvaine Ciavareli; Perina,Fabiano José; Alves,Eduardo.
Rust is considered the most important disease in coffee because it causes severe defoliation in plants and, consequently, reduction in productivity. This study evaluated the in vitro effect of essential oils of cinnamon, citronella, lemongrass, clove, tea tree, thyme, neem and eucalyptus on the germination of urediniospores of Hemileia vastatrix; the effectiveness of these oils to control rust on seedlings of coffee cultivars Catucaí 2SL, Catuaí IAC 62 and Mundo Novo 379/19 in the greenhouse; and the effect of more promising oils on urediniospores of H. vastatrix by transmission electron microscopy (TEM). All the essential oils inhibited the germination of urediniospores with increasing concentrations. All oils promoted partial control of the disease in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemileia vastatrix; Alternative control; Transmission electron microscopy.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000100002
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Extrato de casca de café, óleo essencial de tomilho e acibenzolar-S-metil no manejo da cercosporiose-do-cafeeiro PAB
Pereira,Ricardo Borges; Alves,Eduardo; Ribeiro Júnior,Pedro Martins; Resende,Mário Lúcio Vilela de; Lucas,Gilvaine Ciavareli; Ferreira,Josimar Batista.
O objetivo deste trabalho foi avaliar o efeito de concentrações de extrato de casca de café, óleo essencial de tomilho e acibenzolar-S-metil na germinação, no crescimento micelial e no desenvolvimento in vivo de Cercospora coffeicola, além de caracterizar a eficiência deles como indutores de resistência, e determinar a atividade da enzima peroxidase e o acúmulo de lignina nos tecidos de cafeeiro. O extrato de casca de café não afetou a germinação, entretanto, inibiu o crescimento micelial proporcionalmente ao aumento das concentrações. O óleo essencial de tomilho inibiu a germinação e o crescimento micelial com o aumento das concentrações. O extrato de casca de café e o acibenzolar-S-metil não afetaram a germinação nem o desenvolvimento dos tubos...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cercospora coffeicola; Coffea arabica; Indução de resistência; Microscopia eletrônica de varredura.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001000005
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Potential of essential oils for the control of brown eye spot in coffee plants Ciência e Agrotecnologia
Pereira,Ricardo Borges; Lucas,Gilvaine Ciavareli; Perina,Fabiano José; Resende,Mário Lúcio Vilela de; Alves,Eduardo.
The objectives of this work were to assess the in vitro effect of essential oils extracted from cinnamon, citronella, lemon grass, India clove, tea tree, thyme, neem and eucalyptus on the conidia germination and on mycelial growth of Cercospora coffeicola, and their efficacy to control the brown eye spot in coffee seedlings (cultivars Catucaí 2SL, Catuaí IAC 62 and Mundo Novo 379/19) in a greenhouse, as well as their effects on the initial germination and infection events by scanning electron microscopy. All essential oils promoted the inhibition of conidia germination with increasing concentrations. India clove, cinnamon, neem, thyme and lemon grass oils inhibited the mycelial growth of C. coffeicola. The cinnamon and citronella oils were the most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea arabica; Cercospora coffeicola; Alternative control.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000100014
Registros recuperados: 7
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