Postharvest diseases limit the storage period and marketing life of grapes. Gray mold caused by Botrytis cinerea is one of the most destructive postharvest diseases of grapes. Although the use of synthetic fungicide is still the primary means for controlling postharvest diseases, the indiscriminate use of synthetic fungicides has caused increasingly worldwide concerns over their possible side effects on human health and the environment. Biological control utilizing antagonistic microorganisms has shown great potential as analternative measure to synthetic fungicides for disease control. However,application of antagonistic microorganisms alone does not provide commercially acceptable control of postharvest diseases. Therefore, more environmentally friendly and harmless compounds should be developed as alternative methods for postharvest diseases. Hanseniaspora uvarum, in inhibiting spore germination and lesion growth of B. cinerea, has an antagonistic property. Previous studies have demonstrated that competition for living space may be one of themechanisms of action(Liuetal.,2010a).Liuetal.(2010b) foundthatH.