University of California

High spring temperatures decrease peach fruit size


Gerardo Lopez
R. Scott Johnson
Theodore M. DeJong

Authors Affiliations

G. Lopez is Graduate Student, Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Àrea de Tecnologia Fruticola, Centre UdL-IRTA, Lleida, Spain; R.S. Johnson is Extension Specialist; T.M. DeJong is Professor, both in the Department of Plant Sciences, UC Davis. Author G. Lopez received a FPI grant from the Spanish Ministry of Research and Technology (MCyT) to visit UC Davis.

Publication Information

Hilgardia 61(1):31-34. DOI:10.3733/ca.v061n01p31. January 2007.

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The growth and productivity of peach fruit can be limited by many factors, including weather. Previous research indicated that early-spring temperatures for 30 days after bloom have a strong effect on early peach fruit growth, and both the time and potential fruit size at harvest. We analyzed fruit-size trends of three major cultivars in the California fresh-market peach industry (Flavorcrest, Elegant Lady and O'Henry) over a 20-year period to determine if there is a clear relationship between early-spring temperatures and packed fruit sizes industrywide. This research confirmed two significant trends: the size of packed fruit has increased over the 20-year period between 1985 and 2004, and high early-spring temperatures tended to decrease the size of packed fruit at harvest for any given year.


Ben Mimoun M, DeJong TM. Using the relation between growing degree hours and harvest date to estimate run-times for PEACH: A tree growth and yield simulation model. Acta Hort. 1999. 499:107-14.

Crisosto CH, Johnson RS, DeJong TM, Day KR. Orchard factors affecting postharvest stone fruit quality. Hortsci. 1997. 32:820-3.

Crisosto CH, Mitchell FG, Johnson S. Factors in fresh market stone fruit quality. Postharvest News Info. 1995. 6(2):17-21.

DeJong TM. Using physiological concepts to understand early spring temperature effects on fruit growth and anticipating fruit size problems at harvest. Summerfruit. 2005. 7:10-3.

DeJong TM, Andris H, Beede R, et al. Feasibility of increasing cling peach yields by early thinning. 1992. Sacramento, CA: California Cling Peach Board. 9p. Cling Peach Research Report

Grossman YL, DeJong TM. Maximum fruit growth potential and seasonal patterns of resource dynamics during peach growth. Ann Bot. 1995a. 75:553-60. https://doi.org/10.1006/anbo.1995.1058

Grossman YL, DeJong TM. Maximum fruit growth potential following resource limitation during peach growth. Ann Bot. 1995b. 75:561-7. https://doi.org/10.1006/anbo.1995.1059

Johnson RS, Handley DF. Thinning response of early, mid-, and late-season peaches. J Am Soc Hort Sci. 1989. 114(6):852-5.

Lopez G, DeJong TM. Spring temperatures have a major effect on early peach fruit growth. J Hort Sci Biotech. 2007. In press

Naor A, Klein I, Hupert H, et al. Water stress and crop level interactions in relation to nectarine yield, fruit size distribution and water potentials. J Am Soc Hort Sci. 1999. 124:189-93.

Lopez G, Johnson R, DeJong T. 2007. High spring temperatures decrease peach fruit size. Hilgardia 61(1):31-34. DOI:10.3733/ca.v061n01p31
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