A mechanistic model simulating primary infections of downy mildew in grapevine

Rossi, Vittorio; Caffi, Tito; Giosuè, Simona; Bugiani, R.

doi:10.1016/j.ecolmodel.2007.10.046

Cited by 90 publications

(59 citation statements)

References 20 publications

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“…To the best of our knowledge, most of the efforts to model germination dynamics have assumed that only exogenous factors affect oospore germination. Different modelling approaches, ranging from regression (Rossi et al 2002), mechanistic (Rossi et al 2008a), neural networks (Vercesi et al 2000), to fuzzy-neural models (Guglielmann et al 2002), have recently been explored, and resulted in models that reconstruct the dynamics from temporal series of environmental and climatic variables, and are exploited to simulate either downy mildew primary infections or germination rates. Such models have limited predictive performance, and do not give any insight into the complex processes responsible for germination, since they do not consider the biological mechanisms underlying oospore germination and metabolic processes needed for macrosporangium formation.…”

Section: Introductionmentioning

confidence: 99%

A new approach to modelling the dynamics of oospore germination in Plasmopara viticola

et al. 2010

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Oospores, the only overwintering structures of Plasmopara viticola, the causal agent of grapevine downy mildew, are the unique source of inoculum for primary infections in vineyards. We show that their germination dynamics depend on both climatic and endogenous factors. In particular, overwintering in controlled conditions suggests that low temperatures prolong the oospore germinability, while constant or gradually alternating water availability increases germination rates. However, wide fluctuations in germination percentage, observed both in naturally overwintered oospores, and under controlled conditions, indicate an important role for endogenous factors in the germination frequency. Ad hoc experimental assays and microscopic observations highlight an important role for calcium in the germination process. However, for a profound understanding of the biological mechanisms underlying oospore germination, mathematical models of the germination dynamics are needed. But, classical differential models of germination dynamics are, with current knowledge, prohibitive due both to the complexity of the underlying processes and knowledge incompleteness. Then, we propose a hybrid method derived from the integration of qualitative differential models and fuzzy systems.

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Section: Introductionmentioning

confidence: 99%

A new approach to modelling the dynamics of oospore germination in Plasmopara viticola

et al. 2010

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“…In these countries, epidemics are caused by primary infection, in which an increase in air temperature may accelerate oospore germination (Rossi et al, 2008). With these results, it can be inferred that there will be an increase in the production cost of the grapevine, due to the need for changes in the schedule and the number of fungicide applications (Salinari et al, 2006(Salinari et al, , 2007.…”

Section: Resultsmentioning

confidence: 79%

“…Thus, the temperature increase delayed the appearance of the grapevine downy mildew in seedlings of the analyzed cultivars. According to Rossi et al (2008), in the field, an increase in the number of days between infection and sporangium production may reduce the rate of disease progression.…”

Section: Resultsmentioning

confidence: 99%

Climate change and the occurrence of downy mildew in Brazilian grapevines

Angelotti

Hamada

Magalhães

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to evaluate the potential impact of climate change on the occurrence of grapevine downy mildew in Brazil. Seedlings containing four to six leaves were sprayed with a sporangia suspension containing 10 5 sporangia per milliliter. After spraying, the seedlings were subjected to temperatures of 26, 28, 29.1, 30.4, and 31.8°C for 24 hours. The percentage of diseased leaf area and the latent period were evaluated. Maps of the geographic and temporal distribution of the disease were made considering the monthly average of the mean air temperature and leaf wetness duration for the reference climate or climate normal ) and the future climates (2011-2040, 2041-2070, and 2071-2100), considering the A2 and B1 gas emission scenarios, designed by the Intergovernamental Panel on Climate Change (IPCC). Favorability ranges were set and used in logic functions of the geografical information system (GIS) to generate monthly maps for grapevine downy mildew. Rising temperatures interfered with the grapevine downy mildew infections, reduced the disease severity, and increased the latent period. Future climate scenarios indicate a reduction of favorability of downy mildew in Brazil, with variability in the different grape producing regions.

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“…More recent studies have demonstrated that oospores represent a source of inoculum for P. viticola infection throughout the season (Gessler et al, 2003;Gobbin et al, 2006;Rossi et al, 2013) and in some cases, their contribution to the epidemic as a whole is higher than that of secondary infections, due to sporangia. This new conception of the P. viticola life cycle was recently incorporated in a mechanistic model for the dynamic simulation of primary infections of P. viticola (Rossi et al, 2008), linked to a life-cycle model . The model of Rossi et al (2008) was evaluated in more than 100 vineyards in northern, southern, and insular Italy (from 1995 to 2007) as well as with potted grapevine plants exposed to the inoculum (from 2006 to 2008) , and also in the environmental conditions in the province of Quebec, Eastern Canada, by comparing the time of lesion emergence predicted by the model with field observations (Caffi et al, 2011a,b).…”

Section: Modelling Downy Mildewmentioning

confidence: 99%

“…This new conception of the P. viticola life cycle was recently incorporated in a mechanistic model for the dynamic simulation of primary infections of P. viticola (Rossi et al, 2008), linked to a life-cycle model . The model of Rossi et al (2008) was evaluated in more than 100 vineyards in northern, southern, and insular Italy (from 1995 to 2007) as well as with potted grapevine plants exposed to the inoculum (from 2006 to 2008) , and also in the environmental conditions in the province of Quebec, Eastern Canada, by comparing the time of lesion emergence predicted by the model with field observations (Caffi et al, 2011a,b). This model always showed very high accuracy ) and when used to schedule fungicide application against downy mildew, allowed a reduction from 50 to 66% in pesticide applications, corresponding to an average saving of 174 and 224 V/ha, respectively .…”

Section: Modelling Downy Mildewmentioning

confidence: 99%

A critical review of plant protection tools for reducing pesticide use on grapevine and new perspectives for the implementation of IPM in viticulture

Pertot¹,

et al. 2017

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a b s t r a c tSeveral pests and diseases have grapevine as their favourite host and the vineyard as preferred environment, so an intensive pesticide schedule is usually required to meet qualitative and quantitative production standards. The need to prevent the negative impact of synthetic chemical pesticides on human health and the environment and the consumer expectations in term of chemical residues in food stimulated the research of innovative tools and methods for sustainable pest management. The research project PURE (www.pure-ipm.eu) was a Europe-wide framework, which demonstrated that several solutions are now available for the growers and evaluated several new alternatives that are under development or almost ready for being applied in practice. Although the use of resistant/tolerant varieties is not yet feasible in several traditional grape growing areas, at least part of the synthetic chemical pesticides can be substituted with biocontrol agents to control pests and pathogens and/or pheromone mating disruption, or the number of treatments can be reduced by the use of decision support systems, which identify the optimal timing for the applications. This review presents the state of the art and the perspectives in the field of grapevine protection tools and strategies.

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A mechanistic model simulating primary infections of downy mildew in grapevine

Cited by 90 publications

References 20 publications

A new approach to modelling the dynamics of oospore germination in Plasmopara viticola

A new approach to modelling the dynamics of oospore germination in Plasmopara viticola

Climate change and the occurrence of downy mildew in Brazilian grapevines

A critical review of plant protection tools for reducing pesticide use on grapevine and new perspectives for the implementation of IPM in viticulture

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