Survival, Growth, and Reproduction of the Fall Armyworm (Lepidoptera: Noctuidae) as Affected by Resistant Corn Genotypes1

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Abstract
A comparative study of the fall armyworm, Spodoptera frugiperda (J. E. Smith), reared on leaf-feeding resistant and susceptible corn genotypes was conducted in the field and laboratory in 1983 to determine the effects of resistance on survival, growth, and reproduction of this insect. Larvae reared on resistant genotypes had higher mortality and surviving larvae were significantly smaller at day 7 in both field and laboratory tests than were larvae reared on susceptible genotypes. Significantly longer larval developmental times were required for larvae fed on resistant as opposed to susceptible leaf tissues. Female pupae from larvae reared on resistant leaf tissue weighed 11.4% less than those reared on susceptible leaf tissue. No significant differences among corn genotypes were detected for male pupal weights, duration of pupae development, percent adult emergence and deformity, or female longevity and fecundity. Under laboratory conditions, net reproductive rates of fall armyworm cohorts reared on resistant genotypes were 34–50% less than for those reared on susceptible genotypes, indicating that population size of the following generation would be greatly reduced.

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