BAGWORMS
Bagworms – Nature’s Holiday Ornament !
Bagworms are the larval (caterpillar) stage of a moth that is rarely seen. Only the males develop into moths capable of flight. The adult female is grub-like and remains inside the bag until just before she dies.
Female caterpillar
Male moth
They are perennial pests of arborvitae, juniper, hinoki, as well many other evergreen species. Attacking also some trees such as black locust, honey locust, and sycamore. Most often they prefer stressed or diseased plants.
They LOVE Arborvitae !
Eggs pass the winter inside the bag from the previous year’s female. In Spring theses hatch, and the larvae crawl out from the end of the bag and hide in the foliage. By using silk and bits of plant material, they soon construct a small bag around their hind part. Adult female insects are not very noticeable the first three weeks of their life then suddenly a multitude of bags are seen dangling off the foliage!Amazingly they also spread from one location to another by a process called “ballooning”. After hatching, some of the larvae will climb as high as they can, stand on raised legs with their abdomen pointed upwards ("tiptoeing"), and then release several silk threads into the air. These quickly form a triangular shaped parachute which carries them away with even the slightest breeze.Treatment must begin soon after they bags noticed and continued through the growing season. If untreated, they will consume every last bit of foliage they find until the tree or shrub is reduced to twigs! Once an area has had bagworms, seasonal treatments are recommended every year as a preventative.
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Article written by our Staff Horticulturist, Peter B Morris, BSc, MSc, MBAAll photographs used with permission @SHUTTERSTOCK