Results of a laboratory study show that even low levels of resistant maize, Zea mays L., silks reduced corn earworm, Heliothis zea (Boddie), growth and extended the life cycle by about 3 d. An intermediate level of resistance in maize silks reduced corn earworm growth, extended developmental time by about 8 d per generation, and subsequently reduced egg production by approximately 30%. A high level of resistance in maize silks reduced corn earworm growth, extended the life cycle by about 20 d, and reduced egg production by about 65% per generation. In addition to these parameters, if corn earworm attacked maize each generation, the intermediate level of this type of resistance would eliminate about two generations per year and the high level of resistance 40-50% of the generations per year. Thus, if hybrid maize can be developed with intermediate to high levels of resistance to corn earworm, then populations that usually devastate alternate crops can be dramatically reduced while reducing pesticide use by growers.
Document Type: Research Article
Publication date: April 1, 1990
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