Risk of powdery mildew (Erysiphe necator) outbreaks on grapevines in relation to cluster development

Campbell, Paul; Bendek, Carlos; Latorre, B. A.

doi:10.7764/rcia.v34i1.377

Cited by 14 publications

(25 citation statements)

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“…Uncinula necator counts increased from the start of 'inflores- o C coincided with U. necator peak counts. Gadoury and Pearson (1990) indicate that rainfall of 2.5 mm followed by a four-hour humid period with temperatures between 6 o C and 24 o C enables U. necator ascospore dispersal during these critical stages, from the beginning of flowering to the moment in which berries reach 7 mm of diameter (Campbell et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…The sugary exudates present in pollen and flowers during this phase favour the colonisation of vine tissue by B. cinerea (Esterio et al, 1996). The ideal conditions for U. necator infection coincide with the period from 'beginning of flowering' to the time at which berries attain a diameter of 7 mm (Campbell et al, 2007). Finally, 'flowering' and the beginning of 'development of fruits' are considered the most sensitive phases for P. viticola infection (Díaz et al, 1997).…”

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confidence: 99%

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Estimation of yield ‘Loureira’ variety with an aerobiological and phenological model

Fernández-González

Rodríguez-Rajo

Jato

et al. 2011

Grana

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Estimation of yield ‘Loureira’ variety with an aerobiological and phenological model

Fernández-González

Rodríguez-Rajo

Jato

et al. 2011

Grana

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“…However, based on berry susceptibility, the most critical period is from bloom to about 30 days after bloom (Gadoury et al 2003). Recently, Campbell et al (2007) showed that in Chile, the most critical stage for powdery mildew management were between the beginning of flowering and the appearance of small berries (stage 19 though 29) and concluded that fungicide treatment during flowering is essential to control the disease. The results obtained in our study are somewhat different as adequate control was obtained with a fixed-interval spray program initiated at or soon after flowering (Table 1).…”

Section: Discussionmentioning

confidence: 98%

A degree-day model to initiate fungicide spray programs for management of grape powdery mildew [Erysiphe necator]

Carisse

Bacon

Lefebvre

et al. 2009

Canadian Journal of Plant Pathology

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Powdery mildew, caused by Erysiphe necator, is the most important grape disease in Quebec, Canada. Based on the premise that the production of secondary inoculum is a key factor in powdery mildew development, a model based on degree-day accumulation was developed and validated as a tool to initiate a calendar-based fungicide program. The Richard's model was used to describe the proportion of seasonal airborne inoculum as a function of degree-days (base 6°C) accumulated since the Eichhorn-Lorenz grape phenological stage 7 (2-3 fully expanded leaves). The model explained 91% of the variation in proportion of seasonal airborne inoculum and 96% when validated against independent observations. Reliability of the model to time the initiation of a standard fungicide spray program was validated in experimental vineyards from 2004 to 2007. The following management schemes were compared: (1) no fungicides (control); (2) fungicides applied at fixed intervals starting at the 3-4 leaves growth stage;(3) a fungicide spray program initiated based on the degree-day model; and (4) a fungicide spray program initiated based on both the degree-day model and airborne inoculum concentration. Depending on years and cultivars, the use of the model reduced the number of fungicide sprays by 40% to 55%. The degree-day model could be used as a component of a risk management system for grape powdery mildew to estimate the need for fungicide sprays before bloom or to time the initiation of a fungicide spray program.Key words: disease management, epidemiology, forecasting systems, risk management. Carisse et al.: powdery mildew on grape / degree-day model / fungicide spray program 194Résumé : Le blanc, causé par Erysiphe necator, est l'une des plus importantes maladies de la vigne au Québec. En se basant sur l'hypothèse que la production d'inoculum secondaire est une composante majeure du développement du blanc, un modèle basée sur l'accumulation de degré jours a été développé et validé comme outil de décision quant à l'initiation d'un programme d'application de fongicides. Le modèle de Richard a été utilisé pour décrire la proportion de l'inoculum aérien saisonnier en fonction des degrés jours (base 6°C) accumulés depuis le stade de croissance 7 (2-3 feuilles déployées) sur l'échelle d'Eichhorn-Lorenz. Ce modèle explique 91 % de la variation de la proportion de l'inoculum aérien saisonnier et 96 % lorsque validé avec des données indépendantes. La fiabilité de ce modèle comme outil permettant d'initier un programme d'application de fongicides à intervalle fixe a été évalué dans un vignoble expérimental de 2004 à 2007. Les programme d'application de fongicide suivants ont été évalués :(1) pas de fongicide (Témoin) ; (2) fongicide appliqués à intervalle fixe débutant au stade 3-4 feuilles déployée ;(3) fongicide appliqués à intervalle fixe débutant selon les prédictions du modèle ; et (4) fongicide appliqués à intervalle fixe débutant selon les prédictions du modèle et sur la concentration d'inoculum aérien. L'utilisation du modèle a permis de r...

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“…period for E. necator infection (6,7,13,26). This underscores the importance of early season fungicide applications for control of powdery mildew.…”

Section: Discussionmentioning

confidence: 99%

Effect of High Temperature and Exposure Time onErysiphe necatorGrowth and Reproduction: Revisions to the UC Davis Powdery Mildew Risk Index

et al. 2013

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Peduto, F., Backup, P., Hand, E. K., Janousek, C. N., and Gubler, W. D. 2013. Effect of high temperature and exposure time on Erysiphe necator growth and reproduction: Revisions to the UC Davis Powdery Mildew Risk Index. Plant Dis. 97:1438-1447.Epidemics of powdery mildew, the most important disease of grapevines in California, are driven by moderate temperatures (21 to 30°C). High temperatures can delay or stop the growth and sporulation of Erysiphe necator. Using controlled conditions, we investigated the response of the pathogen's colony growth, conidiospore production, and germination to eight temperatures (30 to 44°C) at 12 exposure times (0.25 to 24 h). The pathogen survived, grew, and reproduced at higher temperatures than previously reported; exposure time was as important as temperature in defining lethal and sublethal effects. Lethal effects started at 36 to 38°C. Lethal exposure times decreased with increasing temperature. Based on this new information on the pathogen's biology, we tested revisions to the high-temperature threshold of the UC Davis Powdery Mildew Risk Index in field settings. No differences in the total number of fungicide applications resulted from the use of either the original or the revised models. However, use of the 38°C for 2 h threshold consistently showed equal (leaves) or better (fruit) disease control compared with the original model, as well as equal disease control compared with a calendar schedule, but with five fewer applications over the 2 years of the study.Grapevine powdery mildew caused by Erysiphe necator

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Risk of powdery mildew (Erysiphe necator) outbreaks on grapevines in relation to cluster development

Cited by 14 publications

References 0 publications

Estimation of yield ‘Loureira’ variety with an aerobiological and phenological model

Estimation of yield ‘Loureira’ variety with an aerobiological and phenological model

A degree-day model to initiate fungicide spray programs for management of grape powdery mildew [Erysiphe necator]

Effect of High Temperature and Exposure Time onErysiphe necatorGrowth and Reproduction: Revisions to the UC Davis Powdery Mildew Risk Index

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