To my knowledge, the moths lay eggs on the forming buds. The buds continue to grow and form around them. By the time they hatch, they eat their way out, destroying the top of the bud. Most the time the first sign is the dying off bud. Then you have to dig around to find the little ******* chomping away. I've sprayed with BC, "safer", forget the long spelling. It's for caterpillars, and is safe to use through flower. It works in the fact that it kills the caterpillars, but they still hatch, eat, and destroy the bud tops before dying.
My thought is that if I could lower the number of moths laying eggs, possibly help... ?? Just an idea. Nothing worse than lightly touching the top of a cola and having the entire beautiful top fall right off.