Nature Conservancy Canada.

Maine Department of Agriculture, Conservation & Foresty.

The Maine Department of Agriculture, Conservation and Forestry has announced an addition to the state's invasive species list. Beech leaf disease, leading to the decline and mortality of beech trees from Ohio to southern New England, has arrived in Maine's forests. The disease was confirmed in leaf samples from a forest in Lincolnville (Waldo County) by Dr. Robert Marra of the Connecticut Agricultural Experiment Station. The Maine Forest Service is asking the public's help in identifying additional areas impacted by beech leaf disease. If you suspect you have found affected leaves submit photos using the MFS tree ailment form, email foresthealth@maine.gov, or call (207) 287-2431. Photos should include a clear shot of the underside of an affected leaf or leaves. However, please report concerns even if photos cannot be provided.

Michigan Department of Natural Resources.

The Michigan departments of Natural Resources and Agriculture and Rural Development today announced the addition of beech leaf disease to the state's invasive species watch list. Invasive species on the watch list have been identified as posing an immediate or potential threat to Michigan's economy, environment or human health. These species either have never been confirmed in the wild in Michigan or have a limited known distribution. Beech leaf disease is associated with the microscopic worm Litylenchus crenatae, a nematode that enters and spends the winter in leaf buds, causing damage to leaf tissue on American beech and European and Asian beech species. Infestations result in darkened, thick tissue bands between leaf veins, creating a striped effect on the leaves, leaf distortion and bud mortality. Trees weakened by leaf damage become susceptible to other diseases and can die within six years. Beech leaf disease has not been found in Michigan. The disease was first discovered in Ohio in 2012. Since then, it has been identified in seven eastern states and Ontario.

Virginia Department of Forestry.

Beech leaf disease has now been confirmed in Prince William County – the first detection in Virginia. The disease affects American beech (Fagus grandifolia) trees and is associated with a foliar nematode. Symptoms include dark stripes between leaf veins, thickening and curling of leaves, and canopy thinning. Contact VDOF's forest health program if you see these symptoms. For more information, view this Beech Leaf Disease Pest Alert (Jan 2021) [PDF, 312 KB] publication.

See also: More Information Relating to the First Report of Beech Leaf Disease in Virginia [Aug 2021) [PDF, 951 KB]

Maine Department of Agriculture, Conservation, and Forestry. Maine Forest Service.

Massachusetts Department of Conservation and Recreation. Bureau of Forest Fire Control and Forestry.

Rutgers University. New Jersey Agricultural Experiment Station.

University of Tennessee Extension.

See also: Publications for more resources

Oregon State University. Extension Service.

This concise publication gives useful information for homeowners, master gardeners, and professional landscapers about the boxwood blight disease: its symptoms, sanitation measures when it is discovered on a property, and preventive measures.

New Zealand Ministry for Primary Industries.

Plant Management Network. Plant Health Progress.

Purdue University. Plant and Pest Diagnostic Laboratory.

See also: Extension publications for more resources

University of Tennessee. Institute of Agriculture.

See also: Publications and Multimedia Catalog for more resources

Wisconsin Department of Agriculture, Trade, and Consumer Protection.

Horticultural Research Institute.

University of Arkansas. Cooperative Extension Service.

See also: Extension Publications for more resources

Pennsylvania Department of Agriculture.

Connecticut Agricultural Experiment Station. Plant Disease Information Office.

University of Vermont. Forest Pathology.

California Oak Mortality Task Force.

See also: COMTF Newsletter