Chlordane kills Army Worms and likely will also kill the Hammerhead worm.
Where can you still buy chlordane ?
Figures
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He's in TX, close to Old Mexico perhaps?
Or, like some boomers I've heard of, they inherited stashes of stuff from their old man's garage. I seem to remember some DDT, chlordane, and a few other goodies the old man kept in the garage near the Clorox bottles.