Chitosan solution

A clear to slightly cloudy solution, free of lumps, with a faint vinegar odor if acidified. Use immediately. Results are not guaranteed: they depend on the preparation, the time of use, and local conditions.

Application

When to use: Routinely

Application description: Use approved by Implementing Regulation (EU) 2022/456 and its review report SANTE/10594/2021 (revised in March 2025): stimulates natural defenses against pathogenic fungi and bacteria in grapevines, olive trees, fruit trees, small fruits, vegetables, spices, forage crops, cereals, lawns, and nurseries (spraying between BBCH 09–10 and BBCH 77–89, depending on the crop); seed treatment for cereals, sugar beets, and seed potatoes; post-harvest immersion of olives and fruits with inedible skins (bananas, kiwis, mangoes, avocados).

Dose: Spraying: 50–100 g/hL (0.5–1 g/L), 200–400 L/ha (grapevines: 200–600 L/ha), or 100–400 g/ha (grapevines: up to 600 g/ha); small fruits: 50–200 g/hL, up to 800 g/ha. 4 to 8 applications spaced 2 weeks apart. Seeds: 50–100 g/hL (beets: 50–200 g/hL), 1 application before sowing or planting, according to the protocol in Appendix I of the report. Post-harvest: fruits with inedible skin, soak in a 1% solution; olives, soak for no more than 60 seconds in a solution of no more than 2%, then air-dry.