HOME GROUNDS FACT SHEET Horticulture Center Cornell University Demonstration & Community Gardens at East Meadow Farm Cooperative Extension 832 Merrick Avenue East Meadow, NY 11554 Nassau County Phone: 516-565-5265 Disease-Resistant Ornamental Trees and Those Relatively Free of Disease
Some trees show resistance to certain of the more Flowering crabapples serious tree diseases. Others are relatively free from * Malus ‘Adams’ o major disease problems under growing conditions found Malus baccata var. himalaica in the Northeast. Many of these latter types are used Malus ‘Cardinal’ All unmarked crab- only occasionally in shade and ornamental plantings, a * Malus ‘Centurion’ o apples are resistant to Malus ‘David’ cedar apple rust, fire fact that may account for the general absence of dis- Malus ‘Donald Wyman’ blight, powdery mildew and scab. eases. However, with the increased limitations on the * Malus floribunda o use of effective fungicides for the control of tree dis- Malus ‘Henry Kohankie’ o Crabapples suscep- tible to one or more eases, it would be advisable to check the lists below Malus ‘Inglis’ of the mentioned dis- and substitute one of these trees for a tree that is Malus ‘Professor Sprenger’ eases, but still worth susceptible to diseases. * Malus ‘Profusion’ planting. Malus ‘Robinson’ * Indicates varieties * Malus sargentii o commonly available on Long Island. Resistant to Dutch elm disease: * Malus ‘Sugar Tyme’ o Ulmus parvifolia (Chinese elm) Ulmus glabra 'camperdownii' (Scotch elm) Junipers resistant to twig blight caused by Resistant to chestnut blight, but Phomopsis juniperovara: susceptible to twig blight and canker: Juniperus chinensis Castanea mollissima (Chinese chestnut) ‘Foemina’ ++ Castanea crenata (Japanese chestnut) ‘Iowa’ ‘Keteleeri’ ++ Resistant to witch’s broom: * ‘Robusta green' Celtis sinensis (Chinese hackberry) * var. sargentii v. 'Glauca' ++ # # also possess Juniperus communis Resistant to the Diplocarpon leaf blight (Paul’s resistance to ‘Depressa’ scarlet hawthorn is especially susceptible): Kabatina twig blight * Crataegus phaenopyrum (Washington hawthorn) ‘Depressa Aurea’ ++ also reported to be * Crataegus viridis ‘Winter King’ (Winter King hawthorn) ‘Repanda’ resistant to cedar var. saxatilis ++ apple rust and cedar * Juniperus Procumbens 'Nana' hawthorn rust Resistant to Cryptodiaporthe canker: Populus maximowiczii (Japanese poplar) * indicates varieties/ Juniperus sabina cultivars available on * ‘Broadmoor’ ++ Long Island Resistant to leaf blotch caused by Guignardia ‘Skandia’ aesculli that is especially damaging to the Juniperus squamata common horse chestnut : ‘Prostrata’ Aesculus arguta (Texas buckeye)) Aesculus parviflora (bottlebrush buckeye) Juniperus virginiana
D-1-20A RW:rb reviewed RT 1/03
Building Strong and Vibrant New York Communities Cornell Cooperative Extension in Nassau County provides equal program and employment opportunities. Resistant to twig blight caused by Phomopsis Trees relatively free of disease: juniperovara: All the following cultivars of: Asimina triloba (pawpaw) [edible fruit] * Chamaecyparis pisifera; Carpinus caroliniana (American hornbeam) ‘Filifera Aurea Variegata’ Carpinus betulus (European hornbeam) ‘Plumosa Aurea’ * Cedrus atlantica (Atlas cedar) ‘Squarrosa Sulphurea Nana’ Cedrus libani (cedar of Lebanon) Cephalotaxus harringtonia v. drupacea Privets resistant to anthracnose: (Japanese plum yew) Ligustrum ovalifolium (California privet) Cercidiphyllum japonicum (Katsura tree) Ligustrum x Ibolium (Ibolium plant) Cladrastis lutea (yellow wood) Ligustrum obtusifolium regelianum (Regel’s privet) Corylus colurna (Turkish hazelnut) Eucommia ulmoides (eucommia) Trees resistant to crown gall: Fagus grandiflora and * F. sylvatica (beech) * Betula nigra (river birch) * Franklinia alatamaha (franklinia) * Carpinus (hornbeam) * Ginkgo biloba (ginkgo) Catalpa (catalpa) Gymnocladus dioica (Kentucky coffee tree) * Cedrus libani (Cedar of Lebanon) * Halesia monticola (silverbell tree) Cladrastis (yellow wood) Hovenia dulcis (Japanese raisin tree) * Cotinus (smoke tree) Kalopanax pictus (kalopanax) * Fagus (beech) Ligustrum lucidum (glossy privet) * Ginkgo (maidenhair tree) * Liquidambar styraciflua (sweet gum) Gymnocladus (coffee tree) * Magnolia sp. (magnolia) Koelreuteria (golden rain tree) Magnolia acuminata (cucumber tree) * Liquidambar (sweet gum) Ostrya virginiana (hop hornbeam) * Magnolia (magnolia) * Oxydendrum arboreum (sorrel tree, sour wood) * Picea (spruce) Parrotia persica (parrotia) * Pinus (pine) Phellodendron amurense (Amur cork tree) Sassafras (sassafras) Pseudolarix kaempferi (golden larch) Sassafras albidum (sassafras) Plants resistant to verticillium wilt: * Sciadopitys verticillata (umbrella pine) * Betula nigra (river birch) * Stewartia pseudo-camellia and Stewartia koreana * Carpinus (hornbeam) (Stewartia) Cercidiphyllum japonicum (katsura tree) * Taxus sp. (yew) * Cornus Kousa (Kousa dogwood) * Taxus cuspidata (Japanese yew) * Fagus (beech) Toona cedrela sinensis (cedrela) * Ginkgo biloba (gingko) * indicates trees available on Long Island. * Liquidambar styraciflua (sweet gum) * Malus (flowering crabapple) Morus (mulberry) * Picea (spruce) * indicates trees commonly [Reprinted, with modifications due to local observations, * Pinus (pine) available on Long Island from Special Circular 175, “Tree Diseases: Description * Pyracantha (firethorn) and Control” by Lester P.Nichols, Plant Pathology, * Quercus rubra (northern red oak) Pennsylvania State University]
D-1-20A RW:rb reviewed RT 1/03