Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine

Buffara, Cláudia Regina Scapin; Angelotti, Francislene; Vieira, Rafael Augusto; Bogo, Amauri; Tessmann, Dauri José; de, Betina Perreira

doi:10.1590/0103-8478cr20131548

Cited by 36 publications

(33 citation statements)

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“…Initially, 10 branches were marked by treatment in the useful area of the plot, each branch with 20 leaves. The severity was estimated by the percentage of diseased leaf area using the scale developed by Buffara et al (2014).…”

Section: Methodsmentioning

confidence: 99%

Temporal dynamics and management of downy mildew on the table grape ‘BRS Vitória’ in northern Paraná

Pereira

Tessmann

Santana

et al. 2018

SCA

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Downy mildew caused by Plasmopara viticola is a major disease of grapes in Paraná State, Brazil and other wine-producing regions. The seedless table grape 'BRS Vitória' stands out for its tolerance to this disease and is a viable alternative to reduce fungicide applications. The objectives of this study were to analyze the influence of weather-related factors, such as temperature and rainfall on disease progress and to evaluate the efficacy of fungicide spray programs for controlling downy mildew of grapes during the summer-fall and winter-spring crop seasons in northern Paraná, Brazil. Field trials were conducted in Marialva, Paraná, during the winter-spring crop seasons (August to December) in 2013 and 2014 and the summer-fall crop seasons (January to May) in 2014 and 2015. The experimental design used was completely randomized with repeated measurements over the phenological periods, with five treatments and 10 replicates. The following treatments were compared: (1) conventional, in which fungicides were applied according to conventional standards; (2) preventive fungicide sprays every seven days; (3) preventive fungicide sprays every 14 days; (4) fungicide sprays after observing the first downy mildew symptoms; and (5) no fungicide sprays. In the conventional fungicide program, sprays were performed two or three times per week. Treatments 2 and 3 received sprayings between the start of branch budding and fruit ripening. In treatment 4, sprays started from the first occurrence of oil spot symptoms, and then, the applications were spaced every seven days until fruit ripening. The severity of disease was evaluated weekly. The disease was severe only in the 2014 and 2015 summerfall crop seasons, reaching a maximum severity of 17.3% and 21.3% of the leaf area, respectively. The highest disease severity in the summer-fall crop seasons was associated with higher frequencies of rainy days and higher temperatures. Disease severity in conventional treatments did not differ from severity in treatments with sprayings made every seven and 14 days during the summer-fall crops in both years. Severity index on bunches were not observed for the evaluated trials. The seedless grape 'BRS Vitória' is less dependent on the use of fungicides to control downy mildew in northern Paraná. ResumoO míldio da videira causado pelo fungo Plasmopara viticola é a principal doença da videira no Paraná e em outras regiões vitícolas do país. A cultivar de uva sem sementes BRS Vitória destaca-se pela tolerância a esta doença e constitui uma alternativa viável para a produção de uva de mesa com menor emprego de fungicidas. Os objetivos deste trabalho foram analisar a influência de fatores climáticos sobre o progresso da doença e avaliar a eficácia dos programas de pulverização de fungicidas para controlar o míldio da videira durante as safras normal e temporã no norte do Paraná, Brasil. Os ensaios de campo foram conduzidos em Marialva, Paraná, durante as safras normal (agosto a dezembro) em 2013 e 2014 e safra temporã (janeiro a maio) e...

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Section: Methodsmentioning

confidence: 99%

Temporal dynamics and management of downy mildew on the table grape ‘BRS Vitória’ in northern Paraná

Pereira

Tessmann

Santana

et al. 2018

SCA

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“…Downy mildew incidence was defined as the number of leaves with downy mildew symptoms divided by the total number of leaves evaluated. Downy mildew severity was assigned using a visual diagrammatic scale based on seven levels of disease severity: 1, 3, 6, 12, 25, 50 and 75% [7]. Downy mildew disease progress curves were constructed and the epidemic were compared using four epidemiological measures: beginning of symptom appearance (BSA), time to reach maximum disease incidence/severity (TRMDI and TRMDS), maximum disease incidence/severity (Imax and Smax), and area under the incidence/severity disease progress curve (AUDIPC and AUDSPC).…”

Section: Methodsmentioning

confidence: 99%

Downy mildew intensity in tolerant grapes varieties in highlands of southern Brazil

Brighenti

Bonin

et al. 2016

BIO Web Conf.

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Abstract. The aim of this study was to evaluate the different degrees of tolerance to infection by P. viticola among three genotypes with constitutive resistance in comparison to susceptible varieties Vitis vinifera. For this purpose two experiments was conducted at EPAGRI Experimental Station, located in the city of São Joaquim, Santa Catarina State, at 2015/16 cycle. In the first experiment on the field, were quantified the incidence and severity and downy mildew intensity was compared by epidemiological variables, on the tolerant varieties Bronner, Regent, Cabernet Cortis and the susceptible Sangiovese. On the second experiment forty leaf discs for the same tolerant genotypes and the susceptible variety Chardonnay were artificially infected with P. viticola sporangia suspension and after seven days of incubation the discs were examined and the degree of infection was estimated based on the intensity of sporangiophore formation. Sangiovese showed highest downy mildew intensity in comparison to the tolerant varieties Cabernet Carbon, Regent and Bronner. Under controlled conditions, the susceptible variety Chardonnay showed higher sporangiophore formation on discs leafs in comparison to the tolerant varieties. All the downy mildew tolerant varieties evaluated showed lower disease development in comparison with V. vinifera varieties.

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“…Downy mildew incidence was defined as the number of leaves with downy mildew symptoms divided by the total number of leaves evaluated. Downy mildew severity was assigned using a visual diagrammatic scale described by Buffera et al (2014) based on seven levels of disease severity: 1, 3, 6, 12, 25, 50, and 75%. Botrytis bunch rot incidence was evaluated at harvest by counting disease clusters per five replicates per treatment, and severity was determined by counting the number of rotted berries per cluster.…”

Section: Methodsmentioning

confidence: 99%

Effect of Y-trellis and vertical shoot positioning training systems on downy mildew and botrytis bunch rot of grape in highlands of southern Brazil

Bogo

Everhart

et al. 2015

Scientia Horticulturae

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Downy mildew (Plasmopara viticola) and botrytis bunch rot (Botrytis cinerea) are important diseases in the highlands of Santa Catarina State, a relatively new wine-growing region in Brazil. Although it is known that training systems can affect microclimate and subsequent disease development, this has not been examined in the highlands of Brazil. Thus, the purpose of this study was to evaluate the influence of Y-trellis (YT) and vertical shoot positioning (VSP) training system on downy mildew and botrytis bunch rot disease development in "Cabernet Sauvignon" cultivar. Experiments were carried out in commercial vineyards in São Joaquim, SC Municipality, southern Brazil, during the year 2012-2013 and 2013-2014 growing seasons. Downy mildew incidence and severity were quantified weekly from the first symptoms appearance on leaves, and botrytis bunch rot incidence was , S C I E N T I A H O R T I C U L T U RA E 1 8 5 (2 0 1 5 )2 evaluated at harvest. Disease progress curves were constructed compared according to: (a) beginning of symptoms appearance; (b) time to maximum disease incidence and severity; (c) maximum disease incidence and severity; and (d) area under the incidence and severity disease progress curve. Results showed significant differences in downy mildew and botrytis bunch rot intensity among grape training systems, where VSP training system showed significantly lower area under the incidence and severity disease progress curve and intensity of downy mildew and botrytis bunch rot in both 2012-2013 and 2013-2014 growing seasons. Collectively, the results of this study suggest VSP training system should be recommended for grapevine production to reduce both downy mildew and botrytis bunch rot in the highlands regions of southern Brazil.

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Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine

Abstract: The downy mildew, caused by Plasmopora viticola, is one of the most important grapevine (Vitis vinifera) diseases in Southern Brazil, causing defoliation and economic losses. The evaluation of disease severity is an important decision for adoption of strategies and tactics

Cited by 36 publications

References 13 publications

Temporal dynamics and management of downy mildew on the table grape ‘BRS Vitória’ in northern Paraná

Temporal dynamics and management of downy mildew on the table grape ‘BRS Vitória’ in northern Paraná

Downy mildew intensity in tolerant grapes varieties in highlands of southern Brazil

Effect of Y-trellis and vertical shoot positioning training systems on downy mildew and botrytis bunch rot of grape in highlands of southern Brazil

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