Bagworms Description:

Bagworms are destructive pests of shrubs and woody ornamentals that are native to North America. Their spindle-shaped protective bags made from silk, debris, and foliage provide camouflage, so they go unnoticed until there is significant plant damage.


Bagworms attack more than 120 species of both deciduous and evergreen trees and shrubs, but the most common species include:

  • Arborvitae
  • Maple
  • Birch
  • Oak
  • Cedar
  • Poplar
  • Elm
  • Spruce
  • Honey locust
  • Willow
  • Juniper
  • Linden

Biology & Symptoms:

Bagworm caterpillars eat the foliage of woody plants. Trees with heavy bagworm infestations may become defoliated entirely. Infested evergreens may not experience re-growth and attacked branches often die.

How to Get Rid of Bagworms:

Cultural, biological, or chemical management practices work together to rid the affected trees and shrubs. Foliar applications of Bt (Bacillus thuringiensis) or any other recommended
insecticide should be made when young larvae are first observed. Thorough foliar coverage is critical.

Heavy infestations may require a second application. Cultural management includes homeowners hand-picking bagworms off the affected trees and shrubs. All bags must be removed and destroyed. One bag left on the tree or shrub could lead to re-infestation. If you think your plants may be infested with bagworms, call your local arborist for a consultation.

See More Articles

Pest And Disease Center Anthracnose Disease Of Deciduous Trees Banner 1440X500
Mold or Fungus

Anthracnose Disease Of Deciduous Trees

Anthracnose is a common and destructive group of fungal pathogens that attack various shade trees.
Read More
Pest And Disease Aphids Banner 1440X500
Mold or Fungus


Aphids, sometimes called plant lice, are soft-bodied, sucking insects. They tend to cluster in large colonies on new growth and come in a variety of species that may be green, black, red, orange, wooly, spotted or bow-legged.
Read More

Get In Touch With Us!

We pride ourselves at Davey Tree on providing prompt, professional and personalized service from certified arborists that live, work and engage in your community. Contact one of our Davey Tree specialists for your residential needs.

Let's Find What
You're Looking For!