A highly viable source of conidia of Botrytis cinerea, suitable for the botrytization of grapes is described. The invention relates to an aqueous composition comprising: conidia of Botrytis cinerea, at least one C3-6 polyol, and at least one monobasic alkaline salt, as well as pre formulates to obtain the same. Methods to perform a botrytization of a grapes, and methods to obtain a botrytized wine using the present compositions are also described.
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