If you have seen these in your landscape, you need to act FAST! A bagworm is exactly as it sounds.. A worm that lives in a bag. They venture in and out of the bag to feed on a plant’s vegetation. Early signs of bag worm injury are brown and stressed needles at the tips. When treating bagworms, use an insecticide and make sure to spray not only the frontside of the plant, but the inside as well. We recommend using a micro encapsulate product that can sustain any given elements. It’s best to treat in the late evening or at dusk during cooler parts of the day when the bag worms are actively feeding.