Cling peaches effectively thinned with 3-CPA
J. La Rue
Authors AffiliationsJ. Beutel is Extension Pomologist, University of California, Davis; J. Yeager is Extension Technician, University of California, Davis; G. Post was formerly Farm Advisor, Sutter County; D. Rough is farm advisors in San Joaquin, Yuba, and Stanislaus counties respectively; W. Anderson is farm advisors in San Joaquin, Yuba, and Stanislaus counties respectively; N. Ross is farm advisors in San Joaquin, Yuba, and Stanislaus counties respectively; F. Perry is farm advisors in Butte, Fresno, Tulare, and Kings counties; M. Gerdts is farm advisors in Butte, Fresno, Tulare, and Kings counties; J. LaRue is farm advisors in Butte, Fresno, Tulare, and Kings counties; L. Brown is farm advisors in Butte, Fresno, Tulare, and Kings counties.
Hilgardia 23(2):10-11. DOI:10.3733/ca.v023n02p10. February 1969.
Four major cling peach varieties (Halford, Peak, Paloro, Carolyn) were effectively thinned with 3-CPA. Proper timing based on ovule length (8.5 to 9.5 mm is best) was essential for best thinning. The best sprays were of 300 ppm applied at 400 gallons per acre, or 1.6 gallons of formulated material per acre. Slight phytotoxicity usually occurred whenever thinning was obtained but was limited to a few yellow leaves which dropped two weeks later and some leaf tipburning and twisting. Fruit harvested after 3-CPA sprays appeared equal in size, maturity and quality to hand-thinned fruit. A small amount of pole or touch-up hand thinning was usually needed in addition to the thinning sprays to attain good commercial thinning.
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