Development of an Infection Efficiency Model for<i>Plasmopara viticola</i>on American Grape Based on Temperature and Duration of Leaf Wetness

Lalancette, N.; Ellis, M. A.; Madden, L. V.

doi:10.1094/phyto-78-794

Cited by 76 publications

(57 citation statements)

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“…It is hypothesized that the increase of rainfall during the 2013-2014 growing season was the major contributing factor for an overall increase in downy mildew severity. This hypothesis is supported by the model proposed by Lalancette et al (1988), which gives greater weight to leaf wetness duration than to average temperatures for estimating disease severity. Thus, duration of leaf wetness can be viewed as the factor that allows infection to take place, whereas temperature determines the rate and extent of infection (Madden et al, 2000;Gindro et al, 2006).…”

Section: Resultsmentioning

confidence: 63%

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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Section: Resultsmentioning

confidence: 63%

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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“…During the month of September and from December to February, differences in disease severity were observed between Jundiaí and São Miguel Arcanjo. This finding calls attention to the fact that in the Lalancette et al (1988) model, greater importance is given to leaf wetness duration for estimating disease severity than to average temperature.…”

Section: Resultsmentioning

confidence: 99%

“…The infestation efficiency model for grape downy mildew adopted in this study was proposed by Lalancette et al (1988), which is expressed as a non linear relationship between infection efficiency (IE), leaf wetness duration (W) and temperature (T):…”

Section: Methodsmentioning

confidence: 99%

“…After climatic data were organized in the GIS, the next step included the production of maps depicting the severity of grape downy mildew, by applying the disease model proposed by Lalancette et al (1988). The estimation of infestation efficiency, defined as the number of lesions produced by zoospores per plant, is a model created as a function of temperature and leaf wetness duration.…”

Section: Methodsmentioning

confidence: 99%

“…The estimation of infestation efficiency, defined as the number of lesions produced by zoospores per plant, is a model created as a function of temperature and leaf wetness duration. The severity of the disease, measured as the number of lesions per square centimeter, was obtained by multiplying the estimated infestation efficiency by a constant (11.2), obtained experimentally by Lalancette et al (1988).…”

Section: Methodsmentioning

confidence: 99%

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Climatic risk of grape downy mildew (Plasmopara viticola) for the State of São Paulo, Brazil

Hamada¹,

Ghini²,

Rossi

et al. 2008

Sci. agric. (Piracicaba, Braz.)

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Viticulture in Brazil has been growing in importance in recent years. In the State of São Paulo, a significant percentage of the production is basically destined to in natura consumption and, more recently, much effort has been made by institutions to revitalize the viticulture in the State. Among fungal diseases, the downy mildew (Plasmopara viticola) is one of the main diseases affecting this crop in Brazil, with extreme damage effects on its production. The objective of this study was to estimate the incidence of the downy mildew on grape under the climatic conditions of the State of São Paulo, based on a mathematical model and using Geographical Information System -GIS tools. The study considered the months from September to April, a period in which the downy mildew can affect grapevines under development. Mean temperature and relative humidity were the basic weather data entered in the GIS database. Leaf wetness duration was estimated from relative humidity measurements. Climatic data entered in the GIS were used to calculate and produce maps depicting the severity of the grape downy mildew, through the application of a disease model. Three cities were evaluated (Jales, Jundiaí, and São Miguel Arcanjo), since they represent the main vineyard centers in the State. The adopted methodology permitted quantifying the severity of the grape downy mildew not only in spatial terms, identifying the variability among the different regions of the State, but also in temporal terms, along the months, making an adequate distinction of the studied cities. Key words: Vitis spp., Geographical Information System, temperature, relative humidity, leaf wetness duration RISCO CLIMÁTICO DO MÍLDIO DA VIDEIRA (Plasmopara viticola) NO ESTADO DE SÃO PAULORESUMO: A viticultura brasileira tem apresentado importância crescente nos últimos anos. Em São Paulo, a expressiva produção é destinada basicamente ao consumo in natura e, mais recentemente, podem ser observados esforços de diversas instituições no sentido de revitalizar a viticultura no estado. O míldio (Plasmopara viticola) é uma das principais doenças da cultura no Brasil, com efeitos extremamente danosos à sua produção. No presente trabalho foi estimada a severidade do míldio da videira nas condições climáticas do estado de São Paulo, com base num modelo de estimativa da doença e empregando-se um Sistema de Informações Geográficas -SIG. O estudo considerou os meses de setembro a abril, período em que a doença pode afetar as videiras em desenvolvimento. Os valores básicos de entrada no banco de dados do SIG foram temperatura média e umidade relativa. A duração do período de molhamento foliar foi estimada a partir dos dados de umidade relativa.

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Forecasting Downy Mildew Diseases

Gilles

2004

Developments in Plant Pathology

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Development of an Infection Efficiency Model forPlasmopara viticolaon American Grape Based on Temperature and Duration of Leaf Wetness

Cited by 76 publications

References 0 publications

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

Climatic risk of grape downy mildew (Plasmopara viticola) for the State of São Paulo, Brazil

Forecasting Downy Mildew Diseases

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