University of California

Fruit Physiological Disorders


Pear: Internal Browning

Page

 

Occurrence
Chinese pear cultivars such as ‘Ya Li,' ‘Daisui Li,' ‘Seuri,' ‘Tse Li,' ‘Shin Li,' and ‘Korean' pears such as ‘Shingo,' ‘Okysankichi,' and Dan be.'

Importance
Internal browning on Asian pears is the main consumer complaint. This is a worldwide problem.

Symptoms
Development of brown to dark brown water-soaked areas in the core and/or flesh occur during storage. There is no visible external indication of internal browning.

Causes
The cause of internal browning is still unknown. Ripening predisposes the fruit to the disorder while it is in cold storage.

Control
Internal browning can be avoided by harvesting Chinese pears earlier than is presently done commercially in the San Joaquin Valley of California. Fruit grown under California conditions and picked later than 180 days (3000 degree days) after full bloom are likely to develop browning during storage.

The fruit should be picked 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. Fruit picked when the skin is completely yellow will develop internal browning within one month after harvest.

Prompt cooling of fruit is recommended as delays in cooling increase the incidence of internal browning in pears that are beginning to turn yellow.

We suggest that growers who are having internal browning problems in Chinese pears keep records of the number of days after full bloom needed for their fruit to start turning light yellow to help them decide when to pick in subsequent years.

References
Beutel, J. 1990. Asian pears, p. 304-308. In J. Janick and J.E. Simon (eds.). Advances in new crops. Timber Press, Portland, OR.

Crisosto, C. H., Kevin R. Day, Steve Sibbett, David Garner, and Gayale Crisosto. 1994. Late harvest and delayed cooling induce internal browning of ‘Ya Li' and ‘Seuri' Chinese pears. HortScience 29(6) 667-670.

Porritt, S. W., M. Meheriuk, and P. D. Lindster. 1982. Postharvest disorders of apples and pears. Agr. Canada Publ. 1737/E.

Use of Materials

The UC Postharvest Technology Center grants users permission to download textual pages (including PDF files) from this World Wide Web site for personal use or to reproduce them for educational purposes, but credit lines and copyright notices within the pages must not be removed or modified.

Except for these specified uses, no part of the textual materials available on the UC Postharvest Technology Center Web site may be copied, downloaded, stored in a retrieval system, further transmitted or otherwise reproduced, stored, disseminated, transferred or used, in any form or by any means, except as permitted herein or with the University of California's prior written agreement. Request permission from UC Postharvest Technology Center. Distribution for commercial purposes is prohibited.

Links to any of these UC Postharvest Technology Center pages are permitted, but no endorsement of the linking site or products mentioned in the linking page is intended or implied by such a link.

How to Cite

Author(s) names. Initial publication or update date (located at the bottom). Title. Link to the specific Fruit Physiological Disorders webpage (Accessed date)

Example: Mitchell, F. G., G. Mayer, and A. A. Kader. 1980. Injuries cause deterioration of sweet cherries. California Agiculture 34(3):14-15.

http://ucanr.edu/sites/Postharvest_Technology_Center_/Commodity_Resources/Fruit_Physiological_Disorders/?uid=20&ds=822 (Accessed January 18, 2014).

College of Agricultural & Environmental Sciences
Postharvest Technology Center
Department of Plant Sciences

Legal notices | Comments & Questions: postharvest@ucdavis.edu | UC Davis

Webmaster Email: postharvest@ucdavis.edu