Onion bulb extract (Allium cepa)
A golden-brown liquid with a strong onion odor; clear after filtration. Use promptly after cooling. Results are not guaranteed: they depend on the preparation, the time of use, and local conditions.
When to use: Routinely and occasionally
Opportunist: Downy mildew (Fungus) Botrytis (grey mould) (Fungus) Alternaria (early blight) (Fungus)
Warning: the associations between recipes and opportunists come from other references (traditional practices, publications, user feedback). They are neither a recommendation nor a claim of effectiveness. There is no certainty regarding the preparation, application and use of these bio-preparations. See the regulations
Application description: Use approved by Implementing Regulation (EU) 2021/81 and its review report: fungicide. Potato: Alternaria leaf spot (BBCH 21–85). Tomato: late blight (BBCH 21–75). Cucumber: gray mold.
Dose: Potatoes: 1 kg of extract per hL, 600–1,000 L of spray mixture per ha (6–10 L of extract per ha, or 0.3–0.5 kg of onion per ha), 3–5 applications every 7 days. Tomato: 1,500 L of spray mixture/ha (15 L of extract/ha, or 0.75 kg of onion/ha), 3–4 applications. Cucumber: every 7 days; for the rest, follow the test report (see link).
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