THE EFFECT OF SPIRAL GIRDLING ON THE FRUIT-SETTING AND DEVELOPMENT OF YOUNG LITCHI TREES
Trunk spiral girdling was carried out on six years old litchi (Litchi chinensis Sonn. Nuomici and Guiwei) trees which poorly fruiting during the early flower bud differentiation phase (about early December). A 1.2 to 1.8 spiral circle with a width of 0.2 to 0.4 cm and a spiral angel of 16-19 degrees was extended into the xylem of the trunk or branch. The wound was almost healed at harvesting time. Compared with the control (no girdling), the ratio of fruit-setting plants was 55.3, 64, 74.7, 78, 74 and 73.3% higher in cultivar Nuomici, and 58, 62.7, 68.7, 73.3, 70 and 65.4% higher in cultivar Guiwei in 2000, 2001, 2002, 2003, 2004 and 2005, respectively. Yield per plant was 2.5, 4.2, 6.5, 9.2, 13.5 and 16.5 kg higher in cultivar Nuomici, and 2.4, 3.8, 5.5, 8.9, 13.9 and 14.8 kg higher in cultivar Guiwei, respectively. The plants with spiral girdling fruited 6 years early than control. Total sugar concentration in fruit of plant with spiral girdling was 3.5 and 2.1% higher than those in control, while total acid concentration was 0.7 and 0.4% lower than those in control in cultivars Nuomici and Guiwei, respectively.
Dongguang Huang, , Shui Liu, , Xianjun Zhou, , Dan Qian, , Caiqiong Wu, and Yiyan Xu, (2012). THE EFFECT OF SPIRAL GIRDLING ON THE FRUIT-SETTING AND DEVELOPMENT OF YOUNG LITCHI TREES. Acta Hortic. 928, 145-150
Litchi chinensis, spiral girdling, fruit development