WSU Tree Fruit Research & Extension Center

Stress Physiology Resources

Thursday, June 29, 2017

Program Personnel

Larry Schrader, Horticulturist/Plant Physiologist
Personal faculty page

Crop Protection Guide

Crop Protection Guide for Tree Fruits in Washington (EB0419)
Full version in pdf format of the WA Crop Protection Guide for Tree Fruit (Extension Bulletin 0419)

Sections: Fruit Protectants
Recommendations for applications of materials to protect the fruit finish of apples and cherries. This is a web page version of EB0419; as such it will contain any recently updated information

Selected Publications

• Schrader, L.E. 2011. Scientific basis of a unique formulation for reducing sunburn of fruits.  HortScience 46(1):6-11

• Felicetti, D.A., and L.E. Schrader. 2010. Postharvest Changes in Pigment Concentrations in 'Fuji' Apples with 'Fuji' Stain. Scientia Hort. 125:283-288.

• Felicetti, D.A. and L. Schrader. 2009a. Changes in pigment concentrations associated with sunburn browning of five apple cultivars. I. Chlorophylls and carotenoids. Plant Sci. 176:78-83.

• Felicetti, D.A., and L.E. Schrader. 2009b. Changes in pigment concentrations associated with sunburn browning of five apple cultivars. II. Phenolics. Plant Sci. 176:84-89.

• Schrader, L.E., C. Kahn, and D.C. Elfving. 2009. Sunburn browning decreases at-harvest internal fruit quality of apples (Malus domestica Borkh.). Intl. J. Fruit Sci. 9:425-437.

• Schrader, L.E., J. Zhang, J. Sun, J. Xu, D.C. Elfving, and C. Kahn.2009. Postharvest changes in internal fruit quality in apples with sunburn browning. J. Amer. Soc. Hort. Sci. 134:148-155.

• Felicetti, D.A. and L.E. Schrader. 2008. Changes in pigment concentrations associated with the degree of sunburn browning of 'Fuji' apple. J. Amer. Soc. Hort. Sci. 133(1):27-34.

• Felicetti, D.A. and L. Schrader. 2008. Photooxidative sunburn of apples: Characterization of a third type of apple sunburn. Intl. J. Fruit Sci. 8:160-172.

• Schrader, L.E., J. Sun, J. Zhang, D. Felicetti, and J. Tian. 2008. Heat and light-induced apple skin disorders: Causes and prevention. Acta Hort. 772:51-58.

• Schrader, L.E., J. Zhang, and W.K. Duplaga. 2001. Two types of sunburn in apple caused by high fruit surface (peel) temperature. Plant Health Progress

• Ritenour, M.A., S. Kochhar, L.E. Schrader, T.P. Hsu, and M.S.B Ku. 2001. Characterization of Heat Shock Protein Expression in Apple Fruit Peel under Field and Laboratory Conditions. J. Amer. Soc. Hort. Sci. 126(5):564-570.


• Schrader, L.E. 2007. Compositions and methods for suppressing cracking and water loss from cherries. U.S. Patent No. 7,222,445 issued May 29, 2007.

• Schrader, L.E. and R. Kammereck. 2005. Use of clay and lipid formulations to protect horticultural crops from sunburn and insect damage. U.S. Patent No. 6,857,224 issued Feb. 22, 2005.

Research Reports: Apple Fruit Quality

Environmental stresses that cause sunburn of apple (2003)

Stress-induced disorders: effects on apple fruit quality (2003)

A New Technology to Increase your Apple Pack-Outs. 2006-07. Hort Expo Northwest.

Fruit Skin Disorders. 2004. WA Tree Fruit Postharvest Conference.

Research Reports: Cherry Cracking

• Schrader, Larry and Jianshe Sun. 2005. Causes and suppression of cherry cracking. Proc. 101st Annual Meeting, Wash. State Hort. Assoc., pp. 115-118.

• Schrader, L.E. and J. Sun. 2006.Cherry Cracking: Causes and Suppression. Proceedings of the Oregon Horticultural Society. 5 pp.

Video of Recent Presentation

Link to ASHS Hort Talks Video Presentation on Sunburn (2009).


Sunburn Protection for Apples
Sunburn and RAYNOX were the topics of an interview with Dr. Schrader by All About Apples.

Weather Links

WSU AgWeatherNet
Current and historical weather tracked by the WSU network of weather stations

WSU Decision Aid System for tree fruit management

National Weather Service
National Weather Service home page

Climate Prediction
A compilation of graphics and links highlighting longer range (3 days to 6 months and more)  forecasts from the National Weather Service

Fruit, sun, and water
Experimental calculator for fruit skin temperature of apples; based on a biophysical model. This calculator was part of the development process for a more empirical model.

Contact Info

Larry Schrader, Horticulturist/Plant Physiologist

Email Address:

Office Location:
Tree Fruit Research & Extension Center, Wenatchee
Office Ph: 509-663-8181 x265
Office Hours: by appointment

Tree Fruit Research & Extension Center, 1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181, Contact Us