Effect of Cane Regulation and GA3 Spray on Berry Thinning in 'Thompson Seedless' Grape (Vitis vinifera L.)

S. D. Shikhamany, Swapnil V. Borade, Sanjay K. Jeughale, Suryakant Y. Patil

Abstract


A field trial was conducted during 2013-14 and 2014-15 fruiting seasons in growers' vineyards around Nashik, Maharashtra, India to improve efficacy of GA3 sprays in berrythinning. As smaller clusters have fewer berries, cluster compactness derived at by number of berries per unit length (cm) of rachis, and, berry-diameter were considered as a measure of berry-thinning. As GA3 effect in berry-thinning is stage-specific, canes uniformly thick in a vine only were retained to achieve uniformity in flowering, by inducing uniform bud-break. Cane regulation did not result in uniformity in bud-break or flowering. Blanket spray of GA3 thrice @ 20g a.i./ha, each coupled with either removal of non-uniform canes or retention of all the canes could effectively reduce cluster compactness by reducing number of berries per cluster, without increasing total length of the rachis/cluster or berry diameter. Vine yield and quality in terms of total soluble solids and acid content were not affected by the treatments. Considering cluster-compactness, yield and ease of cultural operations, retention of all the canes in a vine, coupled with three blanket sprays each of GA3 @ 20g a.i/ha, on alternate days commencing from initiation of the bloom, is recommended for 'Thompson Seedless'.

Keywords


Cane Regulation, GA3 Spray, Uniform Flowering, Cluster Compactness, ‘Thompson Seedless’.

Full Text:

PDF

References


Chadha, K.L. and Shikhamany, S.D. 1999. The Grape Improvement, Production and Post Harvest Management (ISBN: 81-85048-40-1). Malhotra Publishing House, New Delhi, India, pp. 129-30

Christensen, P. 1969. Seasonal changes and distribution of nutritional elements in ‘Thompson Seedless’ grapevines. Amer. J. Enol. and Viticulture, 20:176-90

Coombe, B.G. 1960. Relationship of growth and development to changes in sugars, auxins and gibberellins in fruit of seeded and seedless varieties of Vitis vinifera. Pl. Physiol., 35:241-250

Coombe, B.G. 1992. Research on development and ripening of the grape berry. Amer.J. Enol. Viticulture, 43:101-110

Negi, S.S. and Randhawa, G.S. 1974. Improvement of grapes with special reference to tropical conditions of peninsular India. Indian J. Genetics, 34A:1268-1275

Reddy, N.N. and Shikhamany, S.D. 1990. Comparative efficacy of spray and dip treatments with H2CN2 on bud-break in ‘Thompson Seedless’ grapevines under tropical Indian conditions. Gartenbauwissenchaft, 55(1):27-30

Shikhamany, S.D. and Manjunath, G.O. 1992. Effect of hydrogen cyanamide and date of pruning on bud-break and subsequent shoot growth, yield and quality in ‘Thompson Seedless’ grape. Proc. Int’l. Symp. on Recent Advances in Viticulture and Oenology, Hyderabad (India), pp. 181-87

Shulman, Y., Nir, G., Fangerstein, L. and Lavee, S. 1983. The effect of cyanamide on the release from dormancy of grapevine buds. Scientia Horticulturae, 19:97-104

Turner, J.N. 1972. Practical use of gibberellin in agriculture and horticulture. Outlook on Agriculture, 1:14-20

Williams, L.E. 1987. The effect of cyanamide on budbreak and vine development of ‘Thompson Seedless’ grapevines in the San Joaquin Valley of California. Vitis, 26:107-13

Winkler, A.J., Cook, J.A., Kliewer, W.M. and Lider, L.A. 1974. General Viticulture. University of California Press, Berkeley, USA,. Pp. 138-96 & 338-70