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Density of Imported Cabbage worms (Lepidoptera: Pieridae), Cabbage Aphids (Homoptera: Aphididae), and Flea Beetles (Coleoptera: Chrysomelidae) on Glossy and Trichome-Bearing Lines of Brassica oleracea

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Two new glossy lines, the broccoli 'Broc 5' and the cauliflower 'Glossy Andes' with new genes for glossiness, had similar patterns of insect resistance to those of most other, previously tested glossy lines. Imported cabbageworm larvae, Pieris rapae (L.), were 80% fewer in natural infestations on glossy lines than on normal-wax standard varieties of the same crop, and cabbage aphids, Brevicoryne brassicae (L.), were reduced by over 95%. Unfortunately, all glossy lines tested were highly susceptible to the flea beetles Phyllotreta cruciferae (Goeze) and P. striolata (F.). A trichome-bearing broccoli line developed from an interspecies cross with Brassica incana Tenore was no better than the glossy lines because it had similar levels of flea beetle susceptibility, only a 55% reduction in imported cabbageworm larvae, and a 76% reduction in cabbage aphids, even in a line selected for relatively high trichome density. Artificial infestation of glossy and nornlal-wax lines with imported cabbageworm eggs showed that resistance in glossy lines acted on both the egg and larval stages; thus, even when ovipositional nonpreference was eliminated as a factor, there were 50-85% fewer imported cabbageworm larvae on glossy lines than on normal-wax standard lines.

Document Type: Research Article

Publication date: June 1, 1992

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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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