KC Gardens

Bagworms on junipers


We just got back from being out of town for a couple weeks, and seem to have quite a few bagworms on our Juniper trees and shrubs—a shrub is even brown and dying. Is it too late to spray them? - Thanks, Lynn -


  1. 8 months, 3 weeks ago

    The best time to spray for bagworms is mid- to late May, when the larva are emerging. Once they are closed off in the bags, the worms are very difficult to kill. They are at the end of their cycle now, so I would not recommend spraying.

    Hand picking would be the best way to deal with them now, and if the infestation is severe you should spray next spring.

    Heavy infestations year after year can cause great damage. Whether they are caused or only contributed to the death of the shrub would need further analysis regarding what the shrub looked like this spring, last year, etc.

    Here is the link to the KSU bulletin on Bagworms: http://www.ksre.ksu.edu/bookstore/pubs/MF728.PDF

    Sorry about your less than stellar homecoming.

    Carole Johnson County Extension Master Gardener

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