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Rhonda Ferree's ILRiverHort

Rhonda Ferree's Horticulture Blog

Bagworms...Is it too late to spray?

I had a question about bagworm control. Here are the current University of Illinois Extension recommendations.

If the bags are less than ¾-inch long you can use the microbial insecticide Bacillus thuringiensis kurstaki (Dipel, Thuricide). If large bagworms are present (more than about 3/4-inch long), a conventional insecticide probably will provide better results. The current conventional products listed in our pest management guide are cyfluthrin (Bayer Advanced Vegetable and Garden Insect Spray) or spinosad (Bonide Bug and Slug Killer, Gardens Alive Bulls Eye Bioinsecticide, Conserve, or Fertilome Borer...Spray).

Find my news releases with more information about this pest on our website at

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