Relationship Between Lepidopterous Larval Density and Damage in Celery and Celery Plant Growth Analysis

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The major insect pests of celery in California are the cabbage looper, Trichoplusia ni (Hübner), and the beet armyworm, Spodoptera exigua (Hübner). These two species accounted for 98 and 94% of the larval population in 1978 and 1979, respectively. When larval populations were maintained at different densities, a positive linear correlation (r = 0.95) was found between the mean number of 3rd or later instars of these two species for the last half of the growing season and the mean percent damaged celery plants. Marketable celery petioles appeared about halfway through the growing season. Petioles that are produced before this time die or are stripped from the plants at harvest.

Document Type: Research Article

Publication date: June 1, 1981

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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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