Can bagworm larvae be controlled when females and males are active !

Question

Very large juniper with worm bags is there a way to control progress in August and September then spray again in May.

Answer 1

If there are too many to pull off the bags, you may need to contact your local extension agent for advice. Spraying for them in May when the worms are small is the best treatment. They are hard to eradicate at any other time, except by picking off bags.

https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm