Chemical Fruit Thinning and Other Plant Growth Regulator Uses : New England Tree Fruit Management Guide : UMass Amherst

Apple Thinning Guide (PDF) - Philip G. Schwallier, April, 1996. A classic, includes: Thinning Windows, Thinning Factors, Fruit Set & Thinning Planner, Weather Factors, Apple Thinning Rates and Timing, Materials, Table 1. Thinning and Fruit Set Factors, Fruit Set Evaluation Checkoff, Table 2. Varieties and Thinning Rates, Final Pre-Spray Checkoff