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℃ in vitro. There were no significantly different for germination rates of the cuttings between the treatments at -18 and -21℃ in vitro, with the highest germination of the cuttings observed for defoliation at early-September and control at -27℃. Therefore, orchard management should be performed to be minimized for defolia-tion of the spur leaves until end-August, causing from precipitation and pests.

Ⅰ. 서 론
 Ⅱ. 재료 및 방법
  1. 시험재료 및 처리방법
  2. 조사내용
  3. 통계처리
 Ⅲ. 결과 및 고찰
  1. 가지생장과 저장양분 비교
  2. 과실수량 및 품질 비교
  3. 기내조건에서 삽수의 내한성
 Ⅳ. 적 요
 Reference

• 김병삼(전남농업기술원) | Kim, Byeong-Sam
• 조경철(전남농업기술원) | Cho, Kyung-Chul
• 마경철(전남농업기술원) | Ma, Kyung-Chul
• 윤봉기(전남농업기술원) | Yun, Bong-Ki
• 정석규(대구가톨릭대학교 원예학과) | Jung, Seok-Kyu
• 한점화(원예특작과학원 과수과) | Han, Jeom-Hwa
• 최현석(대구가톨릭대학교 원예학과) | Choi, Hyun-Sug Corresponding author