A Quantitative Model for Describing the Sporulation of<i>Plasmopara viticola</i>on Grape Leaves

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

doi:10.1094/phyto-78-1316

Cited by 50 publications

(31 citation statements)

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“…Among the climatic factors, temperature and leaf wetness are the main determinants in the infection process of grapevine downy mildew. Vine leaves become infected at temperatures of 12 to 28°C in the presence of free water in the leaves (Lalancette et al, 1988). However, the present study observed the occurrence of downy mildew in plants submitted to a temperature of 31.8°C.…”

Section: Resultscontrasting

confidence: 76%

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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Section: Resultscontrasting

confidence: 76%

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 application of polynomial models has the advantage of using simple mathematical calculations that are generally easy to adjust (Steel and Torrie 1980). In agreement with Lalancette et al (1988) and Carisse and Kushalappa (1990), we found that the Richards' model was useful for describing the temperature and time effects on sporulation. This model is more complex than polynomials without being too complicated, considering the wide access to computers.…”

Section: Discussionsupporting

confidence: 74%

“…The function was fitted to the treatment mean of each repetition according to the methodology of Lalancette et al (1988) and Carisse and Kushalappa (1990). First, an equation predicting the parameter A' as a function of temperature was derived by regressing the maximum relative sporulation observed at each temperature against the second-order polynomial of temperature.…”

Section: Discussionmentioning

confidence: 99%

Influence of temperature, cultivar, and time on sporulation ofMycosphaerella fragariaeon detached strawberry leaves

Carisse

Peyrachon²

1999

Canadian Journal of Plant Pathology

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The influence of temperature (5-35°C), cultivar (Chambly, Kent, Oka, Tribute) and temperature, and time (0-108 h) or > sporulation of Mycosphaerella fragariae was studied using a detached leaf assay. Sporulation was estimated as the number of conidia produced per lesion and transformed to relative sporulation. For all cultivars, except Oka, for which temperature was not significant, the highest sporulation occurred at 20°C and no sporulation was observed at 35°C. Relative sporulation varied with cultivar, Tribute being the most susceptible, followed by Kent and by Chambly with only few conidia per lesion. Sporulation started at 5°C, increased with increasing temperature up to 20°C, and then decreased. Relative sporulation was modeled using a second-order polynomial of temperature, and the models explained 85.7, 76.4, and 82.2% of the variation for cvs. Chambly, Kent, and Tribute, respectively. On cv. Tribute, less than 5% sporulation was obtained when leaves were exposed to wetness for 24 h or less. At temperatures of 10-25°C, sporulation increased over time from 24 to 96 h, then stabilized. The Richards' function was used to describe the effect of temperature and time on sporulation (R 2 = 0.90) and to calculate relative risk of sporulation.Résumé : L'influence de la temperature (5-35°C), de la sensibilité de quatre cultivars (Chambly, Kent, Oka, Tribute) et de la temperature, et du temps sur la sporulation de Mycosphaerella fragariae a été étudiée sur des feuilles de fraisier détachées. La sporulation a été évaluée en nombre de conidies par lésion puis exprimée en sporulation relative. Pour tous les cultivars, sauf Oka pour lequel aucun effet de temperature n'a été observe, la sporulation était maximal a 20°C et aucune sporulation n'a été observée a 35°C. La sporulation relative a varié selon Ie cultivar, Tribute étant Ie plus sensible, suivi par Kent, puis par Chambly avec seulement quelques conidies par lésion. Pour ces cultivars, la sporulation a débuté a 5°C, a augmenté graduellement jusqu'a 20°C, puis a diminué. La sporulation relative a été modélisée en fonction de la temperature en utilisant un polynöme du second degré qui a expliqué 85,7, 76,4 et 82,2% de la variation pour Chambly, Kent et Tribute, respectivement. Avec Ie cultivar Tribute, moins de 5% de la sporulation a été observée sur des feuilles exposées a 24 h ou moins de mouillure. A des temperatures de 10 a 25°C, la sporulation relative a augmenté avec Ie temps jusqu'a 96 h puis s'est stabilise. Le modèle de Richards a été utilise pour décrire l'effet de la temperature et de la durée de mouillure (R 2 = 0,90) et pour calculer un indice de risque de sporulation.

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“…In grapes, leaves are diurnally positioned to avoid excessive photon flux density (Gamon and Pearcy, 1989). Lobing, dissection, and serration in grape leaves are important for light to penetrate the canopy, mitigating not only the establishment of fungal infections (Spotts, 1977;Lalancette et al, 1988;Boso et al, 2010;Austin et al, 2011;Austin and Wilcox, 2012) but influencing cluster development and berry composition (Crippen and Morrison, 1986;Hunter et al, 1991;Morrison and Noble, 1990). Trichome density varies immensely in grape leaves, not only protecting against pathogens but providing photoprotection of the photosynthetic apparatus (Liakopoulos et al, 2006), thermoregulation, and boundary layer maintenance.…”

Section: Discussionmentioning

confidence: 99%