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Impact of Feeding by Tomato Fruitworm, Heliothis zea (Boddie) (Lepidoptera: Noctuidae), and Beet Armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), on Processing Tomato Fruit Quality

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Artificial infestations of Heliothis zea (Boddie) and Spodoptera exigua (Hübner) were made on three field plantings of processing tomatoes on a weekly basis in 1982 and 1983 to establish the damage relationship between infestations of each species during the season and damage at harvest. Comparisons of damage by both species were made to determine differences by week, level of infestation, and the week × level interaction. Damage was higher in the sampled plots during the season than in plots infested at the same time but sampled for damage at harvest. In general, the amount of damage recorded at harvest was greater as the date of infestation approached the harvest date. Differences in seasonal damage and damage at harvest were observed between weeks, between levels of infestation, and between the week × level interaction for all of the third-instar H. zea larval infestations, but only for the highest infestation levels of third-instar S. exigua. During 1982, when lower infestation levels were used, differences in damage due to timing of damage were not significant, although the general pattern held. During 1983, late instars were used, resulting in less mortality, higher levels of damage, and less variable damage.

Document Type: Research Article

Publication date: June 1, 1986

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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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