Indian Agricultural Research Institute, New Delhi, India
**Present Address: Indian Institute of Horticultural Research, 255, Upper Palace Orchards, Bangalore-6, India.
*Part of Ph. D. thesis submitted by first author to the P. G. School, I.A.R.I., New Delhi.
Gibberellin application was tried at bloom and post bloom stages in Pusa Seedless grape. The clusters elongated and their looseness of clusters was increased at bloom stage application. Berry size was not increased as much as in case of post-bloom application. However, bunch length did not increase much and cluster compactness was increased to an undesirable degree at post bloom application. Maximum berry enlargement was observed when GA application was made at 5–6 days after full bloom. It was found that single application of GA, either at bloom or at post-bloom stage, was not enough to bring both the desirable results i.e., looseness in the clusters and maixmum berry enlargement.
