one
two
three
Bagworms are a real threat to both evergreen and deciduous trees and shrubs. They are unsightly and weaken the host plant. Bagworms attack many species of trees but prefer evergreens. They defoliate the tree they live on, damaging it or even killing it if the infestation is severe.
When the caterpillar hatches, it crawls out of the bag it hatched from. Bagworms start weaving their own bag immediately. The silk is covered in plant debris and can be hard to see when the bagworms are young. Most people start to notice bagworms in August and September when they are one to two inches long.
The larvae hatch in May and early June. They grow through the summer and continue to add organic matter to their bag for camouflage. In September, the bagworm attaches its bag to a twig. The bags look like Christmas tree ornaments all over the tree.
In the fall, a female bagworm is ready to mate. She has no wings or legs and is inside her protective bag. The males hatch in September and crawl into the bag and mate with the female. She lays 100-200 eggs inside the bag and dies. The eggs overwinter in the mother’s bag.
The most practical method of control is to pick the bags off the tree and crush them, then throw them in the trash. Removing the bags not only kills the eggs and larvae within, but it also prevents that generation from reproducing more bagworms.
The bag around the caterpillar makes chemical control difficult. Chemicals need to be applied to the foliage, not the bag. Spraying a pesticide on the tree that the caterpillar will ingest along with the needles or leaves of the tree is the best way to kill them. The younger the caterpillar, the easier it is to kill it. By August, the bagworm is mature and is not feeding much, so chemical control is unlikely. Don’t waste your time or money on chemicals then.
Both Bacillus thuringiensis and Spinosad will control young bagworms when applied to the foliage. These pesticides are allowed in organic gardening. Products containing acephate, cyfluthrin, or permethrin are also effective chemical control agents when applied to the foliage in early summer. Wet the foliage completely with any pesticide you use, or you will not get good coverage.
Royal Creations Architectural Landscaping customers will be relieved to know that we can treat trees for bagworms. We have the proper equipment and know-how to safely spray every inch of your tree or shrub to kill bagworms before they defoliate your plants. To subscribe to our garden care program, call our office at (816) 825-2524 or schedule a consult.
© 2020 Royal Creations Architectural Landscaping
Terms and Service | Privacy Policy | Careers | Site Map | Warranty
