EFFECT OF TRUNK STRAPPING TIME ON FRUIT SET AND QUALITY IN PERSIMMON CV. MATSUMOTOWASE FUYU

Experiments were conducted to analyze the effect of time of trunk strapping with covered insulated wire (partial girdling) on fruit set, quality and carbohydrate accumulation of leaf, shoot and fruit in 8 year old trees of persimmon cv.Matsumotowase Fuyu.
Trunks, about 30cm above the ground, were strapped with covered insulated wires 2.6 mm in diameter at 2 weeks before full bloom (BFB, 24 April) and full bloom (FB, 8 May). The wire straps were removed 75 days after treatment.
Twelve trees were used, with 4 replicates for each treatment, including a control.
Flowers were hand pollinated using cv.
Zenjimaru pollen.
Fruitlets were counted weekly after full bloom.
Leaves and fruit of bearing shoots were sampled on several occasions for analysis of carbohydrate and nitrogen levels.
For trunk strapping BFB, fruit set of cv.
Matsumotowase Fuyu was higher than in control trees.
Fruit growth at stage 1 was increased by trunk strapping BFB. Fruit growth at stage 3 was increased by both trunk strapping treatments in comparison to the control.
At harvest, fruit size and weight were increased by trunk strapping BFB and fruit soluble solids were increased by both trunk strapping treatments.
At stage 1 of fruit growth, for leaves and shoots, carbohydrate accumulation was increased by trunk strapping BFB. For fruit, after 14 weeks from full bloom, carbohydrate accumulation was increased by trunk strapping BFB. From these findings, the higher accumulation of leaf and shoot carbohydrates in trunk strapping BFB could be related to higher fruit quality.

II International Persimmon Symposium

K. Hasegawa, M. Matsushita, A. Kitajima

Carbohydrate accumulation, Diospyros kaki, Fruit quality, Fruit set, Trunk strapping.

https://doi.org/10.17660/ActaHortic.2003.601.12