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Apple (Malus × domestica Borkh.) is one of the most economically important crops which is widely used either as fresh fruit or as processed foods. Apple fruit is usually introduced to the markets after a storage period of several months. This makes it important to protect fruits against the post-harvest diseases specially in organic production. Blue mold (Penicillium expansum) is one of these diseases, which due to spreading very fast in storage and producing a carcinogenic compound, called patulin, is of particular importance. In the present study, the impact of methyl jasmonate, abscisic acid, salicylic acid, beta-aminobutyric acid, and carbocyclic acid sprayed was investigated on blue mold. Apple fruits of 10 cultivars were surface sterilized and inoculated with spores of fungus, and then were treated with the plant growth regulators. The fruit firmness, softening rate and lesion decay were evaluated. Data were analyzed in a factorial design with two factors i.e., cultivar and plant growth regulator in a completely randomized design in R software package. The impact of hormones was significant on controlling the blue mold, and three plant growth regulators, methyl jasmonate, salicylic acid, and beta-amino butyric acid had the greatest inhibitory impact on the disease. Carboxylic acid and abscisic acid had contradictory impacts on different cultivars, and did not result in significant impacts in some cultivars. The results of this study can be used in the breeding programs in order to help better understand plant disease mechanisms. They can also be applied as a practical method to control blue mold in apple.