Russet on apples, Malus domestica Borkh and other fruits results in lowered fruit quality and substantial economic losses to growers. In this study we investigated the effect of GA3 and GA4+7 on russeting. Russeting index of fruits were estimated at harvest. Apple trees, twenty years old Golden Delicious was sprayed with GA3 at the concentrations10-20 mgL-1 and GA4+7 at 5-10 mgL-1 during petal-fall at 7-10 days 3 time again. All applied concentration of GA3 and GA4+7 reduced russeting in Golden Delicious cultivar significantly and significant difference was found between GA3 and GA4+7 actions. The application of GA3 or GA4+7 caused fruits to shift to elongated shape due to increase of L/D ratio. The application of GA3 or GA4+7caused to increase the weight of Golden Delicious fruit significantly. When GA3 or GA4+7 were separately sprayed on Golden Delicious, it resulted in considerable decrease in russeting neither return bloom nor were fruit set influenced by treatment.
Key words: Apple russeting, Golden Delicious, gibberellins, GA3, GA4+7.
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