Canopy management against downy mildew control
The effectiveness, measured
Time horizon: 1 season
Why it works
An open canopy dries faster and receives copper better, cutting infections and the number of treatments.
What to measure for this pairing
Why this problem matters
Downy mildew (Plasmopara viticola) is the disease that pins the organic grower hardest. Without systemic synthetic fungicides, defence rests on copper and contact products, which only protect what they cover — forcing you to treat ahead of infection and renew after rain.
Management lives on a tension: protect the vineyard without exceeding the EU copper cap (28 kg/ha over 7 years). That means treating at the right moment, at the minimum effective rate, backed by risk models and rigorous logging of every application.
Problem indicators
Certification & rules: Central to organic status and the EU copper cap — audited at certification.
How to apply the means
- 1Remove leaves in the cluster zone after fruit set.
- 2Manage vigour and canopy height to open the canopy.
- 3Favour morning-sun-side leaf removal in hot climates.
- 4Log operations and the effect on disease risk.
Frequently asked
Doesn’t leaf removal expose clusters to sunburn?
In hot climates, yes, if excessive or on the afternoon-sun side. Moderate, morning-side leaf removal balances health and sunburn protection.
Does canopy management replace treatments?
It does not replace them, but it greatly cuts pressure and the number of treatments needed — the prevention that makes the organic programme viable.
Same means, other problems
Same problem, other means — Downy mildew
How GrapeFlow helps
The proof organic certification demands — logged by plot and date.
Downy & powdery mildew risk models
Per-plot disease risk from local weather, to treat at the right moment and spend less copper and sulfur.
Electronic field notebook
All operations — weeding, green manure, biocontrol — logged by plot and date, ready for organic certification.
Phytosanitary register with authorised inputs
Every treatment logged with product, rate and active substance, flagging what is allowed under organic rules — an audit-ready history.