Mitigating Phytopathogenic Diseases in Orchards Through Strategic Irrigation

Abstract

Effective irrigation management is a pillar of orchard productivity and an essential practice for disease control. Water applications modulate soil moisture, canopy microclimate, and plant status, directly influencing sporulation, dispersal, and infection cycles of important plant pathogens, including powdery mildew, apple scab, root rots, *Phytophthora* spp., *Botrytis cinerea* and bacterial species. Traditional overhead sprinklers can increase the risk of some foliar and splash-dispersed diseases by prolonging canopy wetness, but precision methods such as drip, subsurface drip, Regulated Deficit Irrigation (RDI), and sensor-based scheduling deliver water to the root zone, minimizing foliar leaf wetness and canopy humidity. Evapotranspiration-based scheduling avoids waterlogging and root diseases. Integrating fertigation and biological amendments further suppresses pathogens. This strategic approach enhances IDM and IPM, reduces chemical fungicide reliance, and promotes climate-smart, economically viable, sustainable fruit production with improved quality.