Effect of Chlormequat Chloride (CCC) on Morphological Parameters, Fruitfulness and Residue in Grapes

Chlormequat chloride (CCC) is one of the main plant growth regulators which is highly stable gibberellins biosynthesis inhibitor used to inhibit vegetative growth and cell elongation. The present investigation was undertaken to see the impact of different concentrations of Chlormequat chloride (CCC) on morphological characters during foundation pruning (April pruning 2017) to develop GAP (Good Agriculture Practice). CCC was applied as a foliar spray @ 500, 1000, 1500, 2000 and 2500 mg/l concentrations at 5, 7 and 12 leaf stage on Thompson Seedless grape vine at 3 different locations in Sangli district of Maharashtra India. Results obtained from the investigation showed that the treatment of 1000 mg/l at 5 leaf stage, 1500 mg/l at 7 leaf stage and 2000 mg/l at 12 leaf stage was superior in respect to reducing total shoot length, internodal distance, leaf area, cane weight and increased cane thickness, petiole diameter and well developed cluster primordial (Percent fruitfulness) But, the fruit samples showed the presence of CCC residues above European Union MRLs.