Q: Why is thinning the fruitlets early so important?
MP: The cells that will become next year's fruit buds are beginning to form when you can see this year's fruitlets, which are baby apples just starting to form. Properly thinning a tree within the first 30 days after petal fall allows the tree to carry a good fruit crop in the current year and still have enough nutrients to develop next year's crop. Many wild apples tend towards biennial bearing simply because this balance isn't achieved without human intervention. Thinning by hand to leave a single apple every 6 to 8 inches along the branch will double the percentage of large fruit.