Yeast extract (100 and 200 mill) and GA" (20 and 40 ppm) were fol'ar
sprayed on Thompson Seedless and Roumi Red grape cultiva-s The treatments were
done before lIowering (2^nOweek of April) and at full bloom (1" week of May). Fruit set
(%) and number or c1usterslvine of both cultivars were increased significantly. In
addiUon. yield was increased as a result of cluster weight, length and berries weig t.
Number of berries/cluster also improved significantly by yeast extract + GA" and yeast
extrac; treatment alone for "Thompson Seedless" and "Roumi Red'. respectively. I All treatments increased jdce ~ '''~ntage of "Thompson Seedless' bernes,
however, juice content of 'Roum; Red'. :;(.;:~cle solids contenl (SSe), Sse/acid ratio
and total sugars were increased while acidily decreased significantly for both cultivafs.
The combination of yeast extract "'; 1 00 mill and GA" at 40 ppm IS recommended or
improving yield and fruit quality of Thompson Seedless and Roumi Red grape
cullivars.