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Plant Age and Seasonal Variations in Genotypic Resistance of Celery to Beet Armyworm (Lepidoptera: Noctuidae)

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Plant physiological growth stage and growing environment significantly interacted with celery (Apium graveolens L.) genotypes to influence the expression of genetic resistance of celery to the beet armyworm, Spodoptera exigua (Hübner). Plant vegetative growth, as measured by plastochron index, was primarily linear with physiological time and showed no major season-related variations. Insect developmental times from egg to pupa and from egg to adult showed the largest variations during this study, with significant genotype-by-season, genotype-by-plant growth stage, and season-by-stage interactions. Overall, all four celery genotypes tested, 'Tall Utah 52-70R', 'UC-08', 'UC-10', and UC-26, were more resistant to beet armyworm during the warm season and as plants matured. Because both plant age and growing environment proved to interact significantly with plant genotype to magnify or suppress expression of genetic plant resistance to pests, it is important to study test plant genotypes under various growing conditions and at different stages of plant growth to determine the potential genotype-by-environment and genotype-by-stage interactions before characterization and utilization of the resistance in breeding for pest resistance and integrated pest management programs.

Document Type: Research Article

Publication date: April 1, 1994

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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