Abstract
Plant damage and fresh-market yield lossesfrom feeding by fall armyworms, Spodoptera frugiperda (J. E. Smith), at five stages of plant development and five levels of larval infestation were determined for sweet corn (Zea mays L.). Fall armyworms feed on leaves and on tissue developing within the whorls from the early-whorl to midwhorl stages of plant development. Tassel damage occurs primarily during the midwhorl to late-whorl stages of development and ceases after tassels begin to emerge and become exposed. Once tassels emerge, fall armyworms attack the developing ears, bore into the young ears, and cause fresh-market yield loss. Plants infested during the early-tassel stage of development have significantly fewer fresh-marketable ears at harvest compared with all other stages. Leaf-feeding damage, the percentage of damaged tassels, and the percentage of damaged ear shoots increase as the number of fall armyworm larvae per plant increases.
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