According to the fruit size data I collected from our Pink Lady, Gala, Honeycrisp and Fuji trees in Winchester-AREC as appears below; we are in the stage of staring fruit thinning applications. I have attached two charts that you can use as a guide for your thinning treatments at petal fall-5mm, at fruit size (6-18 mm) and fruit size (19- 25 mm). I have also suggested application timings and treatments for return bloom applications that you may consider (Figures 1, 2), especially for Honeycrisp and Fuji. I will follow this post with another one for the carbohydrate thinning model recommendations.
Figure (1): Chemical Thinning and Return Bloom Recommendations for Honeycrisp, Gala and Fuji
Figure (2): Chemical Thinning and Return Bloom Recommendations for Golden Delicious, Idared, Ginger Gold, Pink Lady, and Red Delicious