الفهرس 
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Abstract
The effect of PP333 on vegetative growth, yield and fruit quality of Florda prince, Tropic snow and Swelling peach cvs. was studied during 1996 I 97,
1997 I 98 and 1998 I 99 seasons.
Results indicated that paclobutrazol application either at full bloom or after fruit harvesting considerably reduced shoot and internode length but increased markedly shoot thickness and number of flower buds, regardless of number of applications. This was true for the three studied peach cvs. in both seasons of study. Twice application in two successive seasons was more effective than one application. In other words, PP333 treatment proved to have a carry on effect in the following season.
PP333 applied at full bloom significantly increased tree yield in kg and the increment reached 100 % (Fiorda prince cv.), 80% (Tropic snow cv.) and 165% (Swelling cv.) over the control when the application was done twice in two successive seasons.
In addition, cultar (PP333) either at 1 ml or 2 ml I tree at full bloom markedly increased fruit weight, fruit height, fruit diameter, flesh thickness, fruit colour %
and T.S.S. % in fruit juice at harvesting date of all the considered cvs. On the other hand, acidity % did not respond to PP333 application.
Paclobutrazol added at 0.5 or 1ml I tree after fruit harvest considerably increased tree yield to about 62 -
124 % 1n Florda prince cv., 33-63% in Tropic snow cv.. and 80 - 165% in Swelling cv. lr general, a twice application was better than once application.
PP333 whether at lower or higher level added after fruit harvest, significantly increased fruit weight, fruit colour %, fruit height and flesh thickness in both seasons. but it reduced fruit firmness in one season. On the other hand. such application failed to affect acidity % in both seasons This was true for all fruit quality parameters in the three studied cvs. Meanwhile, twice applications seemed to be more effective than once addition as Florda prince cv. was concerned, whereas the effect of number of applications differs from one season to another as Tropic snow and swelling cvs. were considered.