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The strains of the yeast  Metschnikowia pulcherrima  have strong biocontrol activity against various microorganisms. Biocontrol activity of  M. pulcherrima  largely depends on its iron immobilizing pigment pulcherrimin. Biocontrol activity of pulcherrimin producing strain,  M. pulcherrima  UMY15, isolated from local vineyards, was tested on different molds that cause food spoilage.  M. pulcherrima  UMY15 was a very effective biocontrol agent against  Penicillium roqueforti ,  P. italicum ,  P. expansum , and  Aspergillus oryzae  in in-vitro plate tests. However, the inhibitory activity of  M. pulcherrima  UMY15 was less effective on  Fusarium sp.  and  A. niger  species in biocontrol assays. In addition,  M. pulcherrima  UMY15 strain completely inhibited the germination and mycelia growth of  A. oryzae ,  A. parasiticus , and  Fusarium  sp. spores on artificial wounds of apples when they coinoculated with  M. pulcherrima  UMY15. Moreover, when coinoculated,  M. pulcherrima  UMY15 strain also inhibited the growth of  P. roqueforti ,  P. italicum ,  P. expansum ,  A. oryzae ,  Fusarium sp ., and  Rhizopus sp . in grape juice, indicating that  M. pulcherrima  UMY15 can be used as a very effective biocontrol yeast against various species of postharvest pathogens, including  Penicillium ,  Aspergillus ,  Fusarium , and  Rhizopus .

Biocontrol Activity of the Local Strain of Metschnikowia pulcherrima on Different Postharvest Pathogens