RT Journal Article
SR Electronic
T1 Resistance of Landscape-Suitable Elms to Japanese Beetle, Gall Aphids, and Leaf Miners, with Notes on Life History of <em>Orchestes alni</em> and <em>Agromyza aristata</em> in Kentucky
JF Arboriculture &amp; Urban Forestry (AUF)
FD International Society of Arboriculture
SP 101
OP 109
DO 10.48044/jauf.2010.014
VO 36
IS 3
A1 Jennie M. Condra
A1 Cristina M. Brady
A1 Daniel A. Potter
YR 2010
UL http://auf.isa-arbor.com/content/36/3/101.abstract
AB Twenty genotypes of landscape-suitable Dutch elm disease-resistant elms (Ulmus spp.) were evaluated in a replicated field study for resistance to multiple insect pests in Lexington, Kentucky, U.S. The European elm flea weevil (EEFW), Orchestes alni, a recently-introduced pest that disfigures elms by leaf-mining and adult feeding, was found as a new state record so its feeding preferences and life history were monitored. U. parvifolia and U. propinqua, originally from Japan, were relatively resistant to Japanese beetles, and U. americana was generally less susceptible than most hybrids. Agromyza aristata, a serpentine leaf-mining fly, favored American elms, whereas Kaliofenusa ulmi a blotch-mining sawfly, and aphid (Tetraneura nigriabdominalis) pouch galls were uncommon on American and Asian elms but abundant on certain hybrids. EEFW infested all elms but at highest densities, (&gt;20 mines per 30 cm shoot and &gt;85 adult feeding holes per leaf), on certain hybrids. American elms, especially ‘Jefferson’, were somewhat less susceptible. EEFW laid eggs in expanding leaves; mines were initiated in late April and completed by mid- to late- May. Newly-emerged adults extensively damaged leaves in late May and June but nearly disappeared from tree canopies by mid-July. Implications for re-introduction of elms into urban landscapes are discussed.