Response of some Early and Late Maturing Grape Cultivars to some Hydrogen Cyanamide Treatments

The present investiqation was outlined to study the response of some newly introduced table grape cultivars to hydrogen cyanamide applied at different concentrations and different date on 1-year-old wood during the dormant season after winter pruning. The concerned cultivars were delight, perlette and black rose.Delight and perlette are seedless, early ripening cultivars with wite berries, black rose is a seeded and relatively late ripening (mid-season)cultivar withblack berries. The effect of teated treatments on the vine phenological phases (i.e. time of bidburst,flowering and fruit ripening)was studied.