Influenţa acidului giberelinic asupra calităţii fructelor de măr de soiul Golden Delicious

Abstract

Apple cultivars present different degrees of susceptibility to russeting and fruits in early stages of development are more susceptible than those in later stages. Under orchard conditions, russeting is avoided. For sensitive cultivars the aspect of peel is improved by applying gibberellin GA4+7. The study subject of the experience was Golden Delicious apple variety grafted on M 9. The tested gibberellic acid was GA4+7, (Gerlagib LG). Were experimented the following variants of treatment: 1. Control – no treatment; 2. GA4+7 - 400 ml/ha; 3. GA4+7 - 500 ml/ha. Trees were sprayed 4 times. The experiment was conducted in the 2015year. It was established that, gibberellic acid GA4+7 may be included in prevention system of apple fruits russeting with a, dose of 500 ml/ha, applied up to 3 times by treatment. First treatment should be performed starting at the beginning of petal fall stage and the next 2 treatments 10 days after previous.