Relative Susceptibility of a Summer-Planted Dent and Tropical Flint Corn Variety to Whorl Stage Damage by the Fall Armyworm (Lepidoptera: Noctuidae)1

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Abstract
The production of a second seasonal crop of corn is possible in south Georgia and probably across the gulf South with insecticidal protection of critical leaf stages of the whorl against larvae of Spodoptera frugiperda (J. E. Smith). Naturally established fall armyworm larvae were eliminated from a range of leaf stages of a dent or tropical flint corn variety with methomyl (1.46 kg of AI/ha), thus permitting the identification of those stages on which grain yields were most critically dependent. Grain yields of 65 + q/ha were achieved with methomyl applications at leaf stages 4 and 6 of ‘Pioneer X304C,’ leaf stages 4, 6, and 14 of ‘Pioneer 3369A,’ and methomyl (0.84 kg of AI/ha) protection of the ear stages of both varieties.

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