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Evaluation of Mechanical Damage to Roots of Commercial Varieties of Corn (Zea mays L.)¹

The roots of six commercial varieties of corn, (Zea Mays L.), in 1963 and eight varieties in 1964 and 1965 were mechanically injured to simulate feeding of rootworm larvae. Approximately 0, 25, 50, and 75% of the roots were removed by cutting with a sharpened spade on 1, 2, or 3 dates. Highly significant differences in grain yield and percent lodging resulted from treatments in 1964 and 1965. Differences in percent moisture were significant only in 1964. A highly significant treatment X variety interaction was also present in 1964. The implications of these results in breeding for resistance or tolerance to the corn rootworm are discussed.

Key Words: Root Regrowth • Root Recovery • Rootworm Larval Feeding • Simulated Larval Damage • Artificial Damage • Root Lodging • Breeding for Resistance

² Research Agronomist and Entomologists.

Received for publication March 14, 1968.

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