Summary
This field study demonstrates that mixing potato varieties with differing late blight resistance levels significantly reduces disease epidemics compared to monoculture stands. The findings indicate that disease mitigation improves with increasing variety number and resistance differences between varieties, though the absolute resistance level of individual varieties has limited influence on overall disease reduction. The optimal proportioning of two-variety mixtures depends on the resistance differential between components, with recommendations to either maximise variety number or prioritise resistance diversity when mixture composition is constrained.
UK applicability
These findings are directly applicable to UK potato production, where late blight (Phytophthora infestans) remains a significant disease challenge. The principles of rational in-crop diversification could inform variety selection and planting strategies for growers seeking to reduce fungicide dependency, though UK-specific cultivar combinations and growing conditions would require validation.
Key measures
Percentage of disease reduction (PDR); number of potato varieties in mixture; difference in host resistance (DHR) between component varieties; late blight incidence measured weekly
Outcomes reported
The study measured the percentage of disease reduction (PDR) in potato variety mixtures relative to pure stands, recorded weekly throughout growing seasons. Disease reduction increased with the number of varieties in the mixture and the difference in host resistance between component varieties.
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