The Itália grape cultivar participates with 63,2% of the total growing area in Submedium São Francisco River Valley it's the main variety for exportation. The main objective in this work was to evaluate the effect of CPPU (forchlorfenuron) and GA3 doses on the berry size increase. The products were applied by spraying them on the bunches during the fruit-set stage when the berry size was about 8 mm in diameter. The experiment was done in Cooperyama farm in Juazeiro-BA, Brazil. The experimental design was choosed at random with 8 treatments and 3 repetitions, evaluating 15 bunches per treatment with the following doses: 1- Control; 2- GA3 20 mg/l;3- GA3 20 mg/l+ CPPU 3 mg/l; 4- GA3 20 mg/l + CPPU 5 mg/l; 5- GA3 20 mg/l + CPPU 10 mg/l; 6- CPPU 3 mg/l; 7- CPPU 5 mg/l; 8- CPPU 10 mg/l. The best result in the berry growth was with CPPU 10 mg/l. This treatment differed significantly from the control and from GA3 20 mg/l (the conventional treatment) increasing the berry length in 8% and 4,6%; 13,6% and 7,3% its width and the berry weight in 32% and 16,3 % respectively. In the treatments with CPPU applied alone and/or associated with GA3 the harvest was delayed in eight days. We could not find significative differences in soluble solids rates, but we found that the titrable acidity showed the highest values in the control and in the treatment with GA3 20 mg/l. About the stalks weigh we could not find statistical differences between the treatments.
Vitis vinifera L.; berries size; growth regulators; CPPU; forchlorfenuron; GA3
