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An Evaluation of Methods for Measuring Corn Earworm1 Injury2

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The magnitude of variance ratios obtained from analyses, when 3 corn earworm injury measurement scales (Centimeter, Survey, and Visual) were used on 5 sweet corn single crosses, indicated that under artificial infestation the Centimeter Scale based on depth of penetration gave the most precise measurements. Deviations from normal were found for the frequency distribution of inbred means obtained by a previously used measurement method (Injury Index). Tests for normality of the distribution of individual plants measured on the Centimeter Scale also indicated anormality. The anormalities occurred in both segregating and nonsegregating generations and appeared to be more closely associated with certain inbreds. Anormality of the Centimeter Scale was largely attributed to grouping in a single injury class all ears which had feeding on unfilled tips. A Revised Scale, which eliminates this discrepancy and generates frequency distributions in nonsegregating generations that are essentially normal, is proposed.

Document Type: Research Article

Publication date: June 1, 1967

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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