Fruit Physiological Disorders
Crisosto, C. H. and E. J. Mitcham 2020. UC Davis Postharvest Specialists.
Asian pears are also called Oriental pears, Chinese pears, Japanese pears, Salad pears and Apple pears. The cultivated varieties of Chinese and Japanese pears were developed from Pyrus ussuriensis Maximowicz, P. Serotina Rehder (P. pyrifolia [Burman] Nakai) and possibly other native species.
To avoid internal breakdown development during cold storage and marketing, pick fruit grown under dry, hot, and long summer conditions of the San Joaquin Valley conditions before 180 days (3000 degree-days) after full bloom.
Pick fruit when most of the pears on the tree are still green, although a few at the top may begin to develop some light-yellow spots and smooth surface.
Fruit picked when the skin is completely yellow and smooth will develop internal breakdown after one or two months in cold storage.
We recommend cooling immediately at harvest, as cooling delays yellowing of the pears which results in increased incidence of internal browning in Chinese pears.
We suggest that growers who are having internal breakdown problems in Chinese pears keep records of the number of days after full bloom (degree-days) needed for their fruit to start turning light yellow to help them decide when to pick in subsequent years.
Arzani, K. 2019. Asian pear. In: S. Tonetto de Freitas and S. Pareek (eds.) Postharvest Physiological Disorders in Fruits and Vegetables. CRC Press, Boca Raton, FL, pp. 329-349.
Bai J., R. Prange, and P.M. Toivonen. 2009. Pome fruit. In: E.M. Yahia (ed.) Modified and Controlled Atmospheres for the Storage, Transportation, and Packaging of Horticultural Commodities. CRC Press, Boca Raton, FL, pp. 267-285.
Crisosto, C.H. 2016. Asian pear. In: K.C. Gross, C.Y. Wang, and M. Saltveit (eds.) The Commercial Storage of Fruits, Vegetables, and Florist and Nursery Stocks. USDA Agriculture Handbook 66, pp. 205-209.
Griggs, W., and B. Iwakiri. 1977. Asian Pear Varieties in California. DANR Pub. No. 4068, University of California, Oakland, CA.
Lallu, N. 1990. Fruit growth, handling and storage. In: A.G. White (ed.) Nashi, Asian Pear in New Zealand. DSIR Publishing, Wellington, New Zealand, pp. 53-74.
Meheriuk, M., R.K. Prange, P.D. Lidster and S.W. Porritt. 1994. Postharvest Disorders of Apples and Pears. Agr. Canada Pub. No. 1737/E, Agriculture Canada, Ottawa, Ontario, Canada.
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