Survival, Growth, and Development of Southwestern Corn Borer (Lepidoptera: Pyralidae) on Resistant and Susceptible Maize Hybrids1

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Abstract
Susceptible and resistant maize, Zea mays L., hybrids were artificially infested at the mid-whorl stage of growth with southwestern corn borer (SWCB), Diatraea grandiosella Dyar, larvae in a 2-year study conducted in Mississippi to determine effects on survival, growth, and development of this insect. Beginning on day 7, plants from each hybrid were dissected at weekly intervals for 6 weeks; number and stage of development of insects recovered were recorded. Larvae were also weighed 7, 14, and 21 days after infestation. Significant differences in survival, weight, and length of development occurred between larvae reared on resistant and susceptible hybrids. Correlations between leaf-feeding ratings and SWCB survival and between leaf-feeding ratings and larval weights were highly significant.