The classic "worm in the apple" - a tunnel to the core with frass at the entry hole.
From petal-fall through summer as moths lay eggs on developing fruit.
May Jun Jul
Hang pheromone traps to time sprays; spinosad or kaolin clay on a schedule. Bag individual fruit on small trees.
Pick up drops promptly, band trunks to catch larvae, and thin clustered fruit.
The same products HomesteadSync recommends in the app for this problem.
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HomesteadSync watches your season and flags the pests and diseases likely to hit next - so you are ready, not surprised.