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Chemical blossom thinning in apple orchards is the practice of spraying chemicals during the blossom time to thin the crop. The purpose of blossom thinning is to reduce or prevent the fertilization of a portion of the blossoms that would cause undesired crop loads if left to set fruits. Chemical blossom thinning can be used as a supplemental and/or alternative practice to standard fruit thinning sprays. Increased fruit size, optimized crop load, improved annual bearing, increased return bloom, and more predictable thinning results are all benefits of chemical blossom thinning in apples. This fact sheet describes chemical materials, rates, and models that can be used to maximize the benefits of blossom thinning applications.
Virginia Cooperative Extension materials are available for public use, reprint, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.
Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; M. Ray McKinnie, Administrator, 1890 Extension Program, Virginia State University, Petersburg.
February 11, 2019