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Verticillium Wilt

Verticillium Wilt is caused by a soil-born fungi that infects the vascular system of a tree. This clogs the flow and causes wilt of the leaves and eventually death of entire branches. Norway Maples are very susceptible to this vascular disease.  There is no cure for Verticillium Wilt, but you can extend the life of an infected tree by reducing the stress from other factors.  If you water the tree and mulch with woodchips that are not contaminated with the Verticillium, prune infected braches and steralize tools between cuts, and keep managing its environment you will increase the life by many years depending on severity of infection.  Mulch properly making sure to keep the mulch away from the root flare and apply no more than 4" in depth.

Verticillium will remain in the soil for a long time even after the host tree has been removed.  It is reccomended, if replacing the tree, to choose a resistant species that will have a better chance of survival.

Susceptible Species

Resistant or Immune Species

Almond, apricot, cherry, peach, plum, prune    (Prunus spp.)
Ash (Fraxinus spp.)

Azalea
Barberry (Berberis)
Black Gum (Nyssa sylvatica)
Black locust (Robinia pseudoacacia)
Box elder (Acer negundo)

Catalpa (Catalpa spp.)
Dogwood (Cornus)*
Elm (Ulmus spp.)
​​
Engligh Walnut (Juglans regia)
Golden rain tree (Koelreuteria paniculata)
Horsechestnut (Aesculus hippocastanum)
Judas Tree (Cercis siliquastrum)
Lilac (Syringa vulgaris)
Privet (Ligustrum spp.)
Quince (Cydonia oblonga)
Redbud (Cercis canadensis)
Russian olive, Oleaster (Elaeagnus angustifolia)
Sassafras (Sassafras variifolium)
Serviceberry (Amelanchier)*
Smoke Tree (Cotinus coggygria)
Sour gum (Nyssa sylvatica)
Southern magnolia (Magnolia grandiflora)

Sumac (Rhus Spp.)
Tree-of-heaven (Ailanthus altissima)
Tulip tree (Liriodendron tulipifera)

Viburnum (Viburnum Spp.)
AND MORE...
Apple, flowering crabapples (Malus spp.)
Beech (Fagus spp.)
Birch (Betula spp.)
Box (Buxus spp.)
Dogwood (Cornus spp.)*
European mountain ash (Sorbus aucuparia)

Fig (Ficus carica)
Maidenhair tree/Ginkgo (Ginkgo biloba)
Hawthorn (Crataegus spp.)
Holly (Ilex spp.)
Honey locust (Gleditsia spp.)
Hornbeam (Carpinus spp.)

Ironwood (Carpinus spp.)
Katsura tree (Cercidiphyllum japonicum)
Linden (Tilia spp.)
Mulberry (Morus spp.)
Oak (Quercus spp.)
Oleander (Nerium oleander)
Pear (Pyrus spp.)
Plane tree, sycamore (Platanus spp.)
Pyracantha, firethorn (Pyracantha spp.)
Sweet gum (Liquidambar styraciflua)
Walnut (Juglans spp.)
Willow (Salix spp.)
​AND MORE...


Families or Groups
Resistant

Conifers (cypress, fir, ginkgo,
larch, juniper, pine, sequoia,
spruce, others)

Other monocots (bamboo,
banana, gladiolus, grasses, iris,
lily, onion, orchids, palms,
others)

* Some cultivars or varieties are resistant and some are susceptible also depending on the strain of Verticillium present.