Comparing high-cost and lower-cost remote sensing tools for detecting pre-symptomatic downy mildew (Pseudoperonospora cubensis) infections in cucumbers

•Pre-symptomatic detection of infected plants using a small subset of spectral bands.•Detection of infection by spectral bands in the visible range and red edge region.•Decreased epidermal flavonol content as pre-symptomatic biomarker for infection.•DUALEX optical leaf sensor as affordable tool for...

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