VINIVAX® is a new PDS (Plant Defence Stimulator) that can be used in the fight against powdery mildew in grapes. Composed of laminarin, an active substance extracted from the Laminaria digitata seaweed, VINIVAX® is naturally usable in organic farming. This new biocontrol solution is not subject to resistance phenomena, it offers a 7 to 10-day protection from the first minutes after application and is totally insensitive to rain. The activation of the defences spreads systemically to the entire plant, so that the neo-formed organs are also protected.