THE ”IN VITRO” EFFECT OF CHITOSAN, GRAPEFRUIT EXTRACT AND PYTHIUM OLIGANDRUM ON THE GROWTH OF THE MAIN FUNGAL PATHOGENS OF STEWARTIA PSEUDOCAMELLIA (Max.) Journal title: Progress on Chemistry and Application of Chitin and its Derivatives Authors: Halina Kurzawińska, Joanna Duda-Surman, Piotr Muras Subject(s):