Spray affected plants with a ready-to-use systemic insecticide that contains acephate, imidacloprid or dinotefuran. Systemic formulas do not kill bagworms directly. The active ingredient is absorbed into plant leaves and needles, and then circulated throughout the plant. The insects die when they feed on plant parts and plant sap.
Depending on the size of your garage, insulating the walls with batts of R-13 will typically run you about $400, the ceiling $600, and the garage door will cost about $600 if you do it right (See image to the left). You can use the pink Styrofoam stuff from Home Depot, but that will only insulate your door to about R-6.
If you have an attached garage or simply want to make your garage warmer, insulating the door with foam kits is simple and only takes a few hours to complete. Depending on if you opt for batts, foam boards, or reflective insulation, you'll pay about $200 for a 9' door. Cost: The average cost per square foot is between $0.64 - $1.19. 2  So, for a 500 square foot area, your estimate will vary between $145 to $200, if you do it yourself. 3  For a professional job, add between $150 to $300 for labor, and you're looking at around $300 to $500 for 6 hours of work.