Size and Weight of Sweet Cherry (Prunus avium L. ‘Regina’) Fruit Treated with 3,5,6-TPA and GA3

Th e eff ect of 10 ppm 3,5,6-TPA (3,5,6-trichloro-2-pyridyloxyocetic acid), 20 ppm GA 3 and their combination on size and weight of cherry fruit (Prunus avium L. ‘Regina’) were studied. 3,5,6-TPA was applied 25 days aft er full bloom and GA 3 during stage of fruit color change from green to straw-yellow. Fruit height, width, thickness and weight were measured. Width, thickness and weight of control fruit were the smallest. Fruit from 3,5,6-TPA - treated trees did not show signifi cant diff erence in comparison to control. However, fruit from GA 3 – treated trees had signifi cantly improved all characteristics in comparison to control fruits. Weight of fruit from trees treated with combination of 3,5,6-TPA and GA 3 was 14% higher than control fruit and 2.8% higher than fruit from GA 3 - treated trees, but there was no signifi cant diff erence comparing to fruit from trees treated with GA 3 alone. Th ese results are preliminary results aft er a one-year study and more research should be done to examine the possible infl uence of other factors, such as ecological factors, before fi nal management recommendations could be made.