Extrato de casca de café, óleo essencial de tomilho e acibenzolar-S-metil no manejo da cercosporiose-do-cafeeiro

Pereira, R. B.; Alves, Eduardo; Júnior, Pedro Martins Ribeiro; Resende, Mário Lúcio Vilela de; Lucas, Gilvaine Ciavareli; Ferreira, Josimar Batista

doi:10.1590/s0100-204x2008001000005

Cited by 29 publications

(27 citation statements)

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“…Similarly, Pereira et al (2008) observed reduction of Coffea coffeicola conidial germination when subjected to increasing concentrations of the essential oil of thyme. This effect is probably due to the presence of compounds such as thymol and carvacrol, already known for their fungicidal and bactericidal properties (ZAMBONELLI et al, 2004).…”

Section: Resultsmentioning

confidence: 71%

Essential oils for rust control on coffee plants

et al. 2012

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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 the greenhouse. However, the oils of thyme, clove and citronella, at a concentration of 1000 µL L -1 , were most effective in controlling the disease on cultivars Catucaí 2SL, Catuaí IAC 62 and Mundo Novo 379/19, respectively. The images generated in TEM showed that urediniospores exposed to oils of clove, citronella and thyme promoted cellular disorganization and cytoplasmic vacuolization, which was more pronounced in urediniospores exposed to citronella oil. The oils of thyme, clove and citronella are promising for the control of rust in coffee.Index terms: Hemileia vastatrix, alternative control, transmission electron microscopy. RESUMOA ferrugem é considerada a doença de maior importância no cafeeiro, pois causa acentuada desfolha nas plantas e, consequentemente, redução na produtividade. Este trabalho avaliou o efeito in vitro de óleos essenciais de canela, citronela, capimlimão, cravo-da-índia, árvore-de-chá, tomilho, nim e eucalipto na germinação de urediniósporos de Hemileia vastatrix; a eficácia desses óleos no controle da ferrugem em mudas de cafeeiro das cultivares Catucaí 2SL, Catuaí IAC 62 e Mundo Novo 379/19 em casa de vegetação; e o efeito dos óleos mais promissores sobre urediniósporos de H. vastatrix por meio de microscopia eletrônica de transmissão (MET). Todos os óleos essenciais inibiram a germinação dos urediniósporos com o aumento das concentrações. Todos os óleos promoveram controle parcial da doença em casa de vegetação. No entanto, os óleos de tomilho, cravo-da-índia e citronela, na dose de 1000 µL L -1 , foram os mais eficazes no controle da doença nas cultivares Catucaí 2SL, Catuaí IAC 62 e Mundo Novo 379/19, respectivamente. Nas imagens geradas em MET, observou-se que urediniósporos expostos aos óleos de cravo-da-índia, citronela e tomilho apresentaram desorganização citoplasmática e vacuolização celular, sendo esta mais pronunciada em urediniósporos expostos ao óleo de citronela. Os óleos de tomilho, cravo-da-índia e citronela são promissores no controle da ferrugem em cafeeiro. Termos para indexação:Hemileia vastatrix, controle alternativo, microscopia eletrônica de transmissão.

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Section: Resultsmentioning

confidence: 71%

Essential oils for rust control on coffee plants

et al. 2012

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“…However, a significant increase in levels of soluble lignin was observed in coffee plants treated with citronella essential oil. Pereira et al, (2008) found increased activity of peroxidases in coffee plants sprayed with thyme essential oil and challenged with C. coffeicola seven and eleven days after application. Also, some similar results have been shown in other pathosystems.…”

Section: Resultsmentioning

confidence: 86%

“…Recently, some of these effects, such as cellular disorganization and vacuolization, were observed in urediniospores of H. vastatrix (PEREIRA et al, 2012) and conidia of C. coffeicola (PEREIRA et al, 2008) exposed to citronella essential oil. Billerbeck et al, (2001) and Helal et al, (2007) also reported that the hyphae walls of Aspergillus niger Van Tieghem and A Aspergillus flavus Link, respectively, disappeared in some regions after treatment with citronella essential oil.…”

Section: Resultsmentioning

confidence: 99%

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Citronella essential oil in the control and activation of coffee plants defense response against rust and brown eye spot

et al. 2012

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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 . Plants were inoculated with Hemileia vastatrix and Cercospora coffeicola seven days later. The application was repeated after 30 days. Plants with five months were sprayed with the same treatments to assess the induced defense responses. Citronella oil controlled rust and brown eye spot with efficiencies of 47.2% and 29.7%, respectively, while tebuconazole presented control of 96.5% and 90.5%, respectively. Acibenzolar-S-methyl reduced brown eye spot by 55.9% and showed no significant control of rust. Citronella oil increased peroxidase and chitinase activities in five months coffee plants 336, and 24 and 336 hours after spraying, respectively. Acibenzolar-S-methyl increased peroxidase, chitinase and β -1,3-glucanase activities 192, 288 and 336; 24 and; 240 hours after spraying, respectively. The treatments did not increase accumulation of phenols, but a significant increase in lignin was observed in plants sprayed with citronella oil. Index terms:Hemileia vastatrix, Cercospora coffeicola, Cymbopogon nardus, induced resistance, alternative control of plant disease. RESUMOA ferrugem e a cercosporiose são as principais doenças de cafeeiro. Os prejuízos se devem a intensa desfolha das plantas que têm sua produção e longevidade reduzidas. A cercosporiose também ocorre nos frutos, com reflexos negativos na qualidade da bebida. Alguns óleos essenciais têm apresentado resultados promissores no controle de doenças em plantas, em alternativa ao uso de fungicidas. Neste trabalho, objetivou-se avaliar o óleo essencial de citronela no controle da ferrugem e cercosporiose e na ativação de respostas de defesa em cafeeiro. Plantas com 12 meses foram pulverizadas com o óleo de citronela 1.000 µL L -1 , acibenzolar-S-metil 200 mg L -1 e fungicida tebuconazole 200 mg L -1 e inoculadas com Hemileia vastatrix e Cercospora coffeicola sete dias após. Repetiu-se a aplicação após 30 dias. Plantas com cinco meses foram pulverizadas com os mesmos tratamentos para avaliar as respostas de defesa induzidas. O óleo de citronela controlou a ferrugem e a cercosporiose com eficácias de 47.2% e 29,7%, respectivamente, enquanto tebuconazole apresentou controles de 96,5% e 90,5%, respectivamente. Acibenzolar-S-metil reduziram em 55,9% a cercosporiose da ferrugem e não apresentou controle significativo da ferrugem. O óleo de citronela aumentou as atividades de peroxidase e quitinase em mudas de cafeeiro 336 e; 24 e 336 horas após pulve...

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“…A concentração 50 µg mL -1 de ASM aumentou significativamente a germinação dos conídios in vitro. Pereira et al (2008) O aumento no número de lesões de cercosporiose em cafeeiros previamente tratados com 120 µg mL -1 de harpina, em relação ao controle (Tabela 2), pode estar associado ao estímulo na germinação dos conídios do patógeno na presença da proteína (Tabela 4).…”

Section: Resultsunclassified

Proteção do cafeeiro contra cercosporiose por acibenzolar-S-metil e proteína harpina

Galdeano

Guzzo

Patrício

et al. 2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar, em cafeeiro suscetível, a proteção contra a cercosporiose, pela aplicação da proteína harpina e acibenzolar-S-metil (ASM), e avaliar seu efeito na germinação de conídios e crescimento micelial in vitro. No primeiro experimento, cafeeiros tratados com ASM (25, 50, 100, 200 Protection of coffee plants against brown eye spot by acibenzolar-S-methyl and harpin proteinAbstract -The objective of this work was to evaluate the protective effect of harpin protein and acibenzolar-S-methyl (ASM) against brown eye spot, in coffee plants, and its effect on in vitro conidial germination and mycelial growth of Cercospora coffeicola. In the first assay, plants treated with ASM (25, 50, 100, 200 µg mL -1 ) received the inoculum of a C. coffeicola conidial suspension, and the disease severity was evaluated 30 and 60 days after inoculation. In the second assay, plants were sprayed with harpin (7.5, 15, 30, 60, 120 µg mL -1 ) following the same procedure. In a third trial, plants previously sprayed with ASM (200 µg mL -1 ) or harpin (15 µg mL -1 ) were treated again with these products 30 days after pathogen inoculation. ASM and harpin protected the coffe plants against brown eye spot 30 days after inoculation with C. coffeicola. However, 60 days after inoculation, only ASM (200 µg mL -1 ), with one or two applications, conferred protection to plants against C. coffeicola. Coffee plants were protected against cercosporiosis, when harpin was reapplied on plants 30 days after a previous treatment with this protein. Harpin and acibenzolar-S-methyl did not inhibit the in vitro conidial germination and the mycelial growth of the pathogen.

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Extrato de casca de café, óleo essencial de tomilho e acibenzolar-S-metil no manejo da cercosporiose-do-cafeeiro

Cited by 29 publications

References 18 publications

Essential oils for rust control on coffee plants

Essential oils for rust control on coffee plants

Citronella essential oil in the control and activation of coffee plants defense response against rust and brown eye spot

Proteção do cafeeiro contra cercosporiose por acibenzolar-S-metil e proteína harpina

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