Here's some good information about Texas armyworms. For control we have gotten excellent reports from those spraying kaolin clay and natural diatomaceous earth mixed. Adding Bio Wash makes the spray work even better. Bt product work but kill butterflies and of we never recommend any of the neurotoxin chemical products. For best and most affordable control and the least damage to beneficials, plan to release trichogramma wasps early next season.

Armyworm Onsets Intense September 21, 2010
Texas crop, weather: Armyworm onsets intense after tropical-storm rains

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http://www.dirtdoctor.com/organic/garde ... n/id/3659/