Microbial biocontrol against powdery mildew control
The effectiveness, measured
Time horizon: 1 season
Why it works
Some microbes (e.g. Bacillus, Ampelomyces) reinforce powdery-mildew protection, allowing sulfur to be cut.
What to measure for this pairing
Why this problem matters
Powdery mildew (Erysiphe necator) thrives in warmth and moderate humidity, without needing rain. Under organic rules it is fought mainly with sulfur, complemented by bicarbonates, extracts and biocontrol agents.
Efficacy depends on timing and coverage: start early, in the sensitive post-budburst phase, and hold protection to veraison. An open canopy and close monitoring cut the number of applications needed.
Problem indicators
Certification & rules: Decisive for organic harvest quality; sulfur is an authorised input.
How to apply the means
- 1Choose the agent suited to the target (e.g. Aureobasidium for botrytis).
- 2Apply preventively, respecting viability conditions.
- 3Integrate into a programme with copper, sulfur and prevention.
- 4Log as an authorised input in the notebook.
Frequently asked
Does biocontrol replace copper and sulfur?
Rarely in full. It is most effective as part of an integrated programme, reducing dependence but not eliminating contact means in high-pressure years.
Are the products sensitive to conditions?
Yes — being living organisms, temperature, UV radiation and tank-mix compatibility affect viability. Following the guidance is essential.
Same means, other problems
Same problem, other means — Powdery mildew
How GrapeFlow helps
The proof organic certification demands — logged by plot and date.
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.
Electronic field notebook
All operations — weeding, green manure, biocontrol — logged by plot and date, ready for organic certification.
Downy & powdery mildew risk models
Per-plot disease risk from local weather, to treat at the right moment and spend less copper and sulfur.