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Dispersion: A Spore’s Journey in Vineyards
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Dispersion: A Spore’s Journey in Vineyards

Lucas Ulmer, Fabien Margairaz, Rob Stoll, Walter F. Mahafee and Michelle M. Moyer
p.4
10/2025
DOI:
https://doi.org/10.7273/000008346
pdf
FRAME_FactSheet_Dispersion_20251121686.65 kBDownloadView
Open Access

Abstract

Vineyards Vineyard pathogens Plant Diseases
To better utilize scouting data to manage disease, an understanding of pathogen movement through a vineyard is needed. Exactly how an airborne pathogen spreads in a vineyard is a highly chaotic and complex process that involves interactions among the plant, pathogen, and the topology and microclimate of a vineyard. Understanding how these interactions influence four key events (Fig. 1) that comprise the airborne portion of many plant pathogens' life cycles will aid you in utilizing disease scouting information to refine disease management decisions. Figure 1: The four main stages of pathogen dispersion and the main factors influencing them. Inset: Schematic representation of the spatial and temporal scales involved in pathogen spread (adapted from Mahaffee et al. 2022) While each event has some key factors listed in Fig. 1, there are many more factors and interactions that influence how a pathogen moves through a vineyard. The first event is liberation, where the spore leaves the plant surface it was generated from and crosses the leaf's boundary layer. Next, the spore must escape the region around the original host plant without the spore being deposited back onto the host plant. Once the spore is airborne, it experiences many competing turbulent forces that dictate how far it will be transported in the air (dispersion) before contacting and adhering to a hospitable leaf surface (deposition). Acknowledgement

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