Evaluation of eleven newly acquired Asian elms for their suitability to adult elm leaf beetle (Coleoptera: Chrysomelidae)

Miller, F.; Ware, G.

Journal of Environmental Horticulture 19(2): 96-99


ISSN/ISBN: 0738-2898
Accession: 003438354

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Eleven newly introduced Asian elm species and one reference species were evaluated in no-choice laboratory bioassays for their suitability to the adult elm leaf beetle, Xanthogaleruca (= Pyrrhalta) luteola Muller. Adult female beetles laid significantly more eggs on U. bergmanniana, U. bergmanniana var. lasiophylla, U. castaneifolia, U. gaussenii, U. lamellosa, and U. pumila, indicating these species were the most suitable for ELB. The least suitable species for adult beetle feeding and reproduction were U. chenmoui, U. elongata, U. glaucescens, U. propinqua, U. propinqua var. suberosa, and U. szechuanica. Adult female beetles laid eggs within 7-10 days, or 4 days earlier, on the most suitable elms compared with beetles feeding on the least suitable elms. Adult male and female longevity was significantly affected by host suitability with adult males and females living nearly twice as long on the most suitable elms compared to the less suitable elms. Least suitable species U. U. elongata, U. glaucescens, U. propinqua, and U. szechuanica offer resistance to elm leaf beetle and show promise for future elm breeding programs. Reprinted by permission of the publisher.