Resistance in Corn to the Corn Earworm1 and the Fall Armyworm. 2 IV. Earworm Injury to Corn Inbreds Related to Climatic Conditions and Plant Characteristics3,4

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Correlations obtained between the means for 36 inbred Lines over 2 years indicated that only husk characters and feeding' stimulation (among 14 characters measured) prodded reliable enough information to use in identifying' plant genotypes resistant to injury by the corn car-worm. Heliothis zea (Boddie). Lines with husk length in excess of that required to cover the car tended to have more injury. hut the mechanical protection of tight husks reduced damage considerably. Identification of genotypes with resistance unrelated to husk characters appears possible through laboratory evaluations of the feeding stimulation caused by extracts of kernels. These results suggest that resistance is conditioned by both physical and chemical factors. Relationships between other characters and corn earworm injury fluctuated widely from year to year.

Document Type: Research Article

Publication date: June 1, 1970

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