C. S. Barfield, T. R. Ashley, Effects of Corn Phenology and Temperature on the Life Cycle of the Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), The Florida Entomologist, Vol. 70, No. 1 (Mar., 1987), pp. 110-116
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Barfield et al. (1987) studied this question.