Answer: That complicates things, doesn't it? The bacterium Bacillus thuringiensis (Bt) is registered for use against all three species of sod webworms and is most effective in controlling young larvae. Some commercial products include Dipel, Green Light Bt Worm Killer, Safer Caterpillar Killer, and Thuricide. I'm sure one of these is carried in your local Home Depot garden center.
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