Vangard® WG is a systemic fungicide used to prevent Botrytis cinerea. The active ingredient is cyprodinil. Brand owner Syngenta says ‘attacking diseases in at least two sites, Vangard^® WG inhibits leaf penetration and growth of pathogens within plant tissue. Vangard WG offers systemic, long-lasting protection against a wide range of fungal diseases in a variety of crops both before and after infection.’