Southwestern Corn Borer: Comparison of Techniques for Infesting Corn for Plant Resistance Studies123

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Abstract
For infesting corn plants in plant resistance studies with Diatraea grandiosella (Dyar), infesting with larvae was as effective as the commonly used method of pinning borer eggs onto corn plants in providing uniformly heavy infestations at both the midwhorl and flowering stages of plant growth. Since processing larvae requires less time and effort than eggs, the use of larvae is a feasible alternative method. Leaf feeding ratings for corn infested in the mid-whorl stage were significantly higher with 30 than with 20 eggs or larvae/plant. Stalk damage ratings for corn plants infested at flowering did not differ significantly with 30 and 40 eggs or larvae/plant. No significant differences were found to exist between 1 and 2 applications of eggs or larvae for either plant stage infested except in 1979 when the number of entry and exit holes for corn infested at flowering was found to be higher with 2 applications.

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