Plant Disease (2020) 104, 1291-1297

Giorgia Fedele, Elisa González-Domínguez, Laurent Delière, Ana M. Díez-Navajas and Vittorio Rossi (2020)
Consideration of latent infections improves the prediction of Botrytis bunch rot severity in vineyards
Plant Disease 104 (5), 1291-1297
Abstract: The current study validated a mechanistic model for Botrytis cinerea on grapevine with data from 23 independent Botrytis bunch rot (BBR) epidemics (combinations of vineyards × year) that occurred between 1997 and 2018 in Italy, France, and Spain. The model was operated for each vineyard by using weather data and vine growth stages to anticipate, at any day of the vine-growing season, the disease severity (DS) at harvest (severe, DS > 15%; intermediate, 5 < DS < 15%; and mild, DS ;< 5%). To determine the ability of the model to account for latent infections, postharvest incubation assays were also conducted using mature berries without symptoms or signs of BBR. The model correctly classified the severity of 15 of 23 epidemics (65% of epidemics) when the classification was based on field assessments of BBR severity when the model was operated to include BBR severity after incubation assays, its ability to correctly predict BBR severity increased from 65% to >87%. This result showed that the model correctly accounts for latent infections, which is important because latent infections can substantially increase DS. The model was sensitive and specific, with the false-positive and false-negative proportion of model predictions equal to 0.24 and 0, respectively. Therefore, the model may be considered a reliable tool for decision-making for BBR control in vineyards.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Vittorio Rossi, Elisa González-Domínguez

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
thresholds/decision-support systems

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Botrytis cinerea	Grapevine (Vitis)	France
	Botrytis cinerea	Grapevine (Vitis)	Italy
	Botrytis cinerea	Grapevine (Vitis)	Spain (continental)