What Kills Bagworms on Cedar Trees?

A biological control method to kill bagworms in trees is to spray the tree with Bacillus thuringiensis, or Bt. Bt is a bacteria that eradicates the bagworms after they ingest it. You can spray in the late spring as a preventative measure or in mid-July when the bagworms are actively feeding on the tree.

How do you get rid of bagworms on cedar trees?

A biological control method to kill bagworms in trees is to spray the tree with Bacillus thuringiensis, or Bt. Bt is a bacteria that eradicates the bagworms after they ingest it. You can spray in the late spring as a preventative measure or in mid-July when the bagworms are actively feeding on the tree.

Can cedar trees recover from bagworms?

This picture, sent in recently by a homeowner, shows a red cedar heavily defoliated by bagworms. If you've ever seen a deciduous tree (one that loses its leaves in the fall) defoliated by caterpillars you may have noticed that, if otherwise healthy, the tree will quickly re-leaf and recover within a few weeks.