Fruit Quality of Wonhwang Pear Trees with Low-pesticides and In Vitro Regrowth of Stem Cuttings as Affected by Time of Defoliation
2015
Kim, B.S., Jeonnam Agricultural Research Extension Services, Naju, Republic of Korea | Cho, K.C., Jeonnam Agricultural Research Extension Services, Naju, Republic of Korea | Ma, K.C., Jeonnam Agricultural Research Extension Services, Naju, Republic of Korea | Yun, B.K., Jeonnam Agricultural Research Extension Services, Naju, Republic of Korea | Jung, S.K., Catholic University of Daegu, Gyeongsan, Republic of Korea | Han, J.H., National Institute of Horticultural and Herbal Science, RDA, Wanju, Republic of Korea | Choi, H.S., Catholic University of Daegu, Gyeongsan, Republic of Korea
The study was conducted on the effects of time of defoliation on fruit quality of pear (Pyrus pyrifolia Nakai) trees, managing with low-pesticides, and regrowth of stem cuttings in vitro. Treatments included for 40% of uniform defoliation at early-August, end-August, and early-September, as well as control (no defoliation). Defoliation at early-September and control increased growth of water sprouts as well as concentrations of carbohydrates, total nitrogen, and free sugar in one-year old shoots. Defoliation at early-September and control increased fruit yield and mean fruit weight, with high soluble solids content and fruit surface color of a* observed for both defoliation at end-August and early-September. Defoliation at early-August increased rates of electrolyte leakage in stem cuttings at -18 degrees centigrade in vitro. There were no significantly different for germination rates of the cuttings between the treatments at -18 and -21degrees centigrade in vitro, with the highest germination of the cuttings observed for defoliation at early-September and control at -27degrees centigrade . Therefore, orchard management should be performed to be minimized for defoliation of the spur leaves until end-August, causing from precipitation and pests.
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