Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

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

Abstract

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. 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. davidiana var. japonica], U. propinqua var. suberosa [?U. 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. chenmoui, U. elongata, U. glaucescens, U. propinqua, and U. szechuanica offer resistance to elm leaf beetle and show promise for future elm breeding programmes.