This time of year bagworm larvae are noticeable on many conifers. These caterpillars travel in a cone shaped 'bag' that both conceals them until their size make them noticeable in the landscape. Conifers or needled evergreens can be severely damaged. Bagworms prefer juniper, arborvitae, spruce, pine, and cedar but also attack deciduous trees.

Broad leaf evergreens such as southern magnolias, hollies, boxwoods and taxis (or yews) are resistant to bagworm attack. Early detection and spraying with an appropriate insecticide can control these insects.                                                                

UK has a great publication for Kentuckians that can help you if bagworms become an issue in the future. There is a table of insecticides, both organic and inorganic, at the end of the publication: https://entomology.ca.uky.edu/files/efpdf2/ef440.pdf

The following link can help you determine when to spray in the spring using timing controls based on other blooming plants in the landscape.

https://entomology.ca.uky.edu/files/efpdf4/ent66.pdf

Feel free to contact our office if you have other questions.

Let me know if I can help you further!


Carol Wilder
Horticulture Technician
Jefferson County Cooperative Extension Service
Email: <personal data hidden>

<personal data hidden>
200 Juneau Drive
Louisville KY 40243