Paclobutrazol is classified chemically in the family of triazoles (Diterpenoid carboxylic acids) and is considered one of the growth regulators and plant hormones such as gibberellin and abscisic acid, that are used as sprays on grapevines to improve vegetative characteristics and yield quality. This study was carried out during the 2018/2019, 2019/2020, and 2020/2021 seasons to examine the effect of spraying Paclobutrazol on the superior grapevine. Application of Paclobutrazol at three levels (0, 500, and 1000 ppm) at the time of bud burst. Results showed a reduction in total shoot and bud numbers, increased fruit set, and increased berry weight, fruit yield, and fruit quality for all PBZ treatments compared to the control. The yield was harvested on the third week of June. The main objectives of this work are to study the impacts of Paclobutrazol on earlier, improved berry quality, and increased yield of superior seedless grapes for exportation.

The fusion of developmental events depends heavily on phytohormones. The physiological consequences of active gibberellins vary based on the gibberellin GA3 type found in the grapevine plant. During the 2018/2019, 2019/2020, and 2020/2021 seasons superior grapevines were sprayed with GA3 at concentrations (0, 10, 20, and 40 ppm) at the pea stage "6 mm" to study its effect on vegetative growth and yield. All treatments had a positive impact on increasing the studied vegetative growth while at the same time increasing yield/treatment and cluster weight, improve the berry quality, and other parameters. The main objectives of the research are delaying the ripening of grapevine clusters, and thus prolonging the period of harvesting the crop and obtaining it for long periods, which brings great economic benefit, and obtaining a grape crop with export specifications in terms of the quality of grape clusters and berries. This is a natural storage of the fruits for a date later than the normal date, which brings a profitable economic return to the farmer.

Different treatments were carried out inluding that achieved in the modern packing houses which are established for preparing citrus fruits for export. Decay of Washington navel oranges was reduced due to spraying benlate at 500 and 750 ppm as a preharvest treatment. Fruits coated with thin film of wax containing benlate were less susceptible to decay than any other treatment including that carried out in the packing houses. On the other hand no adverse effect could be noticed for this treatment on the chemical properties of the fruils. Thereby, the disinfectant process which is followed by rinsing could be eliminated, conseqently, raising the productive capacity of these packing houses.

Spraying Roomy Red grapes with benomyl 15 days before harvesting was effective than the control in decreasing decay percentage during 77 days cold storage(2-3°C). On the other hand, it was of meaningless effect on shattering and bleaching. Adding sodium bisulfite at a rate of 0.25 and 0.50 gms/skgs fruits just before storage minimized decay and shattering percentage. Simultaneously, no significant influence could be detected concerning its influence on bleaching. Sodium bisulffite reduced losses in grapes, weight as well as total soluble solids and acidity than the control and benomyl treatments. The studied parameters in grapes treated with benomyl and solium bisulfite as a pre and post-harvest treatment did not differ statistically than that of those treated with sodium bisulfite alone.

The present investigation was carried out during 1994 and 1995 seasons on `Roomy Red' grape vines cultivated in Minia and Beni Suef governates to study the effect of Dormex and/or overcropping on `Roomy Red' grape vines. Bud opening, number of clusters per vine, as well as the yield and its physical and chemical properties, were studied. Results indicated that Dormex overcame the irregularity of bud opening. At the same time, bud opening preceded the control by about 4 weeks. The percentage of bud opening, fruit set, as well as the number of clusters per vine, were increased. On the other hand, over-cropping had a vice versa effect on the previous parameters as compared with the control. Results also indicated that onion was of less effect than berseem in this concern.