Abstract

When plant densities were varied for five sweet corn, Zea mays (L.)> hybrids, a within-row spacing of 30.5 cm sustained significantly less corn earworm (CEW), Heliothis zea (Boddie), injury than spacings of 61.0 and 90.5 cm during 2 of 3 years. Differences among spacing means for CEW injury could not be removed through adjustment by covariance techniques involving tiller number, days to mid-silk, or husk extension as covariates. The present practice of avoiding non-competitive plots when recording CEW injury must be continued if valid comparisons among hybrids are to be made.

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