Evaluation of Tropical and Subtropical Corn Lines for Resistance to Second-Generation European Corn Borer (Lepidoptera: Pyralidae)

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Open-pedigree corn (Zea mays L.) inbred lines with tropical (38 lines), subtropical (55 lines), and temperate (27 lines) origins were evaluated for resistance to secondgeneration European corn borer, Ostrinia nubilalis Hũbner. Five plants in each plot were infested during anthesis with 10 applications of 50 larvae or 500 per plant. Relative ratings for resistance were taken 50-60 dafter anthesis based on a nine-point rating scale (1, no sheath collar feeding damage to 9, severe damage). Differences among mean resistant ratings of the 120 lines were significant; higher resistance was associated with lines having tropical and subtropical germplasm. Twenty-two lines had resistance ratings <3.5, and most included either tropical or subtropical germplasm. Resistant ratings were correlated significantly with days to anthesis and silking and plant and ear height. Transfer of the resistant genes from the tropical germplasm to temperate germplasm should be done with caution because of their sensitivity to photoperiodism.

Document Type: Research Article

Publication date: August 1, 1989

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