얼룩과는 배 재배중에 사용하는 봉지 종류에 따라 수확시발생률이 다른데 흡습성과 투기성이 불량한 이중 봉지인 신문 봉지를 사용한 경우 수확시 발생률이 75%로 가장 높았으며 저온 저장중에는 습도가 높을수록 많이 발생하여 저장 180일까지 폴리에틸렌 필름 밀봉구에서 54～100% 까지 발생하였다 또한 수확 시기가 늦어질수록 얼룩과 발생이 많아져 관행 수확기보다 일주일 빠른 9월 하순에 수확한 배보다 10월 초순이나 10월 중순에 수확한 배는 저장중에

Causal factors related to the skin disorder such as black stains during cold storage of 'Niitaka' pear fruit are of great importance to solve the postharvest disorder problems. The morphological and biochemical changes observe of pear skin affected by different harvest times and storage environments. Occurrence rate of black stain in 'Niitaka' pear fruit was the highest in newspaper bagging with 75% among various bagging materials at harvest time because of the high relative humidity within the double layer paper bags. During cold storage, the rate was 54～100% in 30 polyethylene (PE) film packaging. As the harvest time was postponed, the rate increasedduring cold stoinge. The into was 1.5 to 2.4 times higher in pears harvested in late September than in those harvested in early and mid October. There was no significant difference in occurrence of black stain fruit between the 30 and 50 PE film bags. The causal fungus of the black stain pear was assumed as Gloeodes pomigena (Schweintz, 1920). The treatment of 0.1～0.5 ppm ozone gas prevented the occurrence of the pear fruit black stain until 180 days after cold storage. The ozone treatment on the affected fruit was also effective in preventing the progress of the black stain.

• 홍윤표
• 정대성
• 이승구