Propolis, natural product made by bees and extracted from their beeswax. It is permitted for use in organic and Biodynamic agriculture. It acts as an antibiotic. It protects against bacteria, heals damaged tissues and stimulates plant resistance. Propolis contains vitamins and flavonoid and is a preventative treatment, particularly for leafy crops and fruit, ahead of adverse climatic conditions. Winegrowers use it as an antiseptic on grapes affected by, for example, hail. It can also be used against powdery mildew (oïdium), in combination with sulfur.