Apple production is a complex process involving orchard, storage and marketing phases. The postharvest diseases originating from wound infection at harvest or during postharvest handling and packing can be a serious limiting factor for such storage. Blue mold caused by Penicillium expansum is an important postharvest disease on apples worldwide and is an economic concern not only for the spoilage of the fresh fruit but also for hazarding the public health. This is because that P. expansum is generally regarded as the major producer of the mycotoxin patulin and ability of this fungus to grow if it is stored at low temperature (0 ºC). Until now, this disease has been controlled by application of synthetic fungicides. Development of fungicide-resistant pathogens and fungicide toxicity, have motivated the search for alternative approaches. Biological control has been developed as an alternative to synthetic fungicides and it is considerable success has been achieved by utilizing antagonistic microorganisms for controlling postharvest diseases...