Missouri Pest Monitoring Network
True Armyworm, Pseuduletia unipuncta (Haworth), overwinter as partly grown larvae in Missouri. There are two to three generations each year in Missouri, but the larvae of the first generation in May and June causes the most feeding damage.
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Identification and Field Scouting
Management of the Armyworm Complex in Missouri Field Crops (G7115)
Newsletter Articles for True Armyworm
True Armyworm vs. Grass Sawfly (06/06/11)