Orchard Microclimate Control as a Way to Prevent Kiwifruit Decline Syndrome Onset

Summary

This field trial investigated whether orchard microclimate control through over-tree micro-sprinkler irrigation and shading nets could mitigate Kiwifruit Decline Syndrome (KiDS), a multifactorial disorder associated with high vapour pressure deficit and temperature stress in Mediterranean kiwifruit cultivation. The combined intervention reduced leaf temperature, enhanced stem water potential and stomatal conductance, and modified root xylem anatomy in ways consistent with reduced water stress. The findings suggest that agronomic management of microclimate offers a practical approach to protecting kiwifruit from climate-driven hydraulic stress and declining plant health.

Regional applicability

Kiwifruit is not a major commercial crop in the United Kingdom; however, the physiological principles of microclimate control through irrigation and shade management are transferable to protected horticulture and other temperature-sensitive perennial crops grown in UK orchards or under cover. Climate change projections suggest vapour pressure deficit stress may become relevant to UK horticulture, making the findings of potential future relevance.

Key measures

Leaf temperature, stem water potential, stomatal conductance, photosynthesis, root starch content, xylem vessel diameter, xylem vessel density, vulnerability to cavitation index

Outcomes reported

The study evaluated the efficacy of over-tree micro-sprinkler irrigation combined with shading nets in mitigating kiwifruit decline syndrome (KiDS) through measurement of leaf gas exchange, leaf temperature, stem water potential, stem growth, root starch content, and xylem vessel morphology and vulnerability. Over-tree irrigation with shading reduced leaf temperature, increased stem water potential and photosynthetic capacity, and altered root xylem vulnerability to cavitation, suggesting that microclimate control can reduce KiDS risk.

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