- Annosum Root Rot
- Heterobasidion irregulare
- Anthracnose
- Bacterial Leaf Scorch
- Xylella fastidiosa
- Beech Leaf Disease
- Laurel Wilt
- Harringtonia lauricola
- Littleleaf Disease
- Oak Wilt
- Bretziella fagacearum
- Phytoplasmas (aka Yellows)
- Pine Needle Diseases
- Thousand Cankers Disease
- Geosmithia morbida
Thousand Cankers Disease
Thousand cankers disease is caused by the fungus Geosmithia morbida, and this pathogen is transmitted by the walnut twig beetle, Pityophthorus juglandis. This disease impacts black walnut and, until 2010, was only found west of the Mississippi River. The disease gets its name from the many tiny black cankers caused by the fungus growing in the phloem. This fungus is brought in by walnut twig beetles, which bore into the tree and create galleries. In addition to the cankers and tiny beetle entrance holes, infected trees also exhibit yellow foliage, wilting, and eventual branch mortality. One beetle and canker will not kill the tree, but mass attacks by beetles can result in thousands of little cankers that eventually coalesce and girdle the tree. There are no known control or management options for thousand cankers disease. Care should be taken to prevent the spread of the disease by buying local firewood, or wood from which you know the source, and watching for symptoms in existing trees.
Evaluation of Thousand Cankers Disease-Symptomatic Juglans nigra in Southwestern Ohio Following Population Collapse of Pityophthorus juglandis
US Forest Service, University of Minnesota, Purdue University, 2022Managing Thousand Cankers Disease in High-Value Plantings of Black Walnut (Fagales: Juglandaceae) in Washington State
Purdue University, 2022Thousand cankers disease complex: a forest health issue that threatens Juglans species across the U.S.
University of Tennessee, 2016Hardwood Diseases in the Southeastern U.S.
University of Kentucky, 2022EDDMapS - Thousand Cankers Disease
https://www.eddmaps.org/distribution/usstate.cfm?sub=56599Thousand Cankers Disease
The Nature Conservancy and Southern Regional Extension Forestry, 2016Thousand Cankers Disease
USDA APHIS, 2024Thousand Cankers Disease: Everything You Need to Know in Half an Hour
Emerald Ash Borer University, 2021Thousand Cankers Disease: Research Update
KY Forest Health, 2022thousandcankers.com
https://thousandcankers.com/