bagworm infestation

Asked June 25, 2020, 5:27 PM EDT

I have just detected for the second year, bagworms on an arborvitae. They are now just 1/4 inch long. Apart from removing them by hand, which I've started to do, what are the least toxic ways to get rid of them especially at the top of a tall arborvitae? Also, if necessary, what is an effective pesticide to use against them? Thanks, John

Baltimore County Maryland

3 Responses

Apart from removing the insects and bags by hand, you can use a biological control product called Bacillus thuringiensis (Bt) to control the young bagworms. Now is actually a very good time to do this since the product only works well on the young/small bagworms. Consult and follow the product label directions. Multiple sprays may be necessary. Here is a link to more information.
https://extension.umd.edu/hgic/topics/bagworms-trees-and-shrubs

Christa

Christa, thanks very much for your response to my question. Glad to know that UME is still available to offer expert advice.

John