Performance of Maize Inbred Line DE811 in Hybrid Combinations: Resistance to First- and Second-Generation European Corn Borers (Lepidoptera: Pyralidae)

Publisher Website
Google Scholar
Abstract
Inbred line DE811 was crossed with 12 dent maize, Zea mays L., inbred lines. The 12 inbred lines, plus DE811 and a check inbred line, and 12 single crosses, plus two single-cross checks, were planted in a modified randomized block design for 3 yr, with five replications each year. First-generation European corn borer, Ostrinia nubilalis Hübner, plots were separate from the second-generation European corn borer plots (two hills of three plants for each plot in each experiment). Plants in the first-generation tests were infested during the midwhorl stage of plant development, whereas plants in the second-generation tests were infested during anthesis. Plants in each test were infested with 12 egg masses (300 eggs) per plant in six applications of two masses, spaced 1 d apart. Leaf-feeding ratings in the first-generation tests were made 3 wk after egg hatch. Sheath-collar feeding ratings and stalk damage were made 60 d after egg hatch in the second-generation tests. In combination with several susceptible inbred lines, DE811 resistance showed partial dominance for resistance to leaf feeding by first-generation European corn borers and for resistance to sheath-collar feeding and stalk damage by second-generation European corn borers. Single crosses of DE811 × resistant inbred lines had high resistance to both European corn borer generations.