Management of the Armyworm Complex in Missouri Field Crops
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The true armyworm, Pseuduletia unipuncta (Haworth), overwinters as a partly grown larva in Missouri. Resident armyworms are further supplemented by migrants that arrive during the first week of April. There are two to three generations each year in Missouri, but the larvae of the first generation in May and June usually cause the most feeding damage.
Archive version. For the most recent information see extension.missouri.edu.
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