Resistance of Elms of the Ulmus davidiana Complex to Defoliation by the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae)

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Selected elms of the Ulmus davidiana complex and their hybrids growing at The Morton Arboretum, Lisle, IL, were evaluated in laboratory bioassays for feeding preference and suitability for the adult elm leaf beetle, Pyrrhalta luteola (Müller). No-choice feeding studies revealed that U. davidiana, U. japonica, U. propinqua, and the hybrid U. davidiana × U. propinqua were the least suitable for feeding and reproduction by the elm leaf beetle. The hybrid U. davidiana × U. japonica, U. wilsoniana, and U. pumila were more suitable for feeding and reproduction. The preovipositional period was not a function of suitability because adults feeding on the least suitable species/hybrids oviposited at approximately the same time as females feeding on the more suitable elms such as U. davidiana × U. japonica, U. pumila, and U. wilsoniana. Suitability had no significant effect on male and female longevity nor did male/female longevity affect suitability of elm species/hybrids evaluated in this study. Beetles feeding on caged elms exhibited a similar suitability ranking as in the no-choice laboratory feeding study. Fully and partially unsuitable species/hybrids of U. davidiana, U. japonica, U. propinqua, and U. davidiana × U. propinqua, show promise for future elm breeding programs.

Keywords: Pyrrhalta luteola; Ulmus davidiana; leaf beetle

Document Type: Research Article

Publication date: October 1, 1999

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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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