Apple Tree Caterpillar Prevention

Question

I have an apple tree in my yard, and last year I believe it got caterpillars. There was a white spider-like web encasing a bunch of branches and my apples had small black holes through them (as if a worm would burrow through the apple), mostly through the top where the stem is down into core. My guess is caterpillar. Anyways, what can I spray them with to prevent this from happening? And when do I spray?

Answer 1

These articles should help: https://www.gardeningknowhow.com/edible/fruits/apples/apple-maggots.htm, https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm