Most Damaging Forest Diseases

An Index of Common Tree Diseases
There are over 20 tree disease that contribute to health decline and death of most of the trees in the United States. This list of tree diseases cause most tree health problems and death. These diseases are the cause of significant replacement expense of yard trees and the commercial expense of future losses of forest products.

Common Hardwood Tree Disease - Prevention and Control

Common Conifer Tree Diseases - Prevention and Control
Softwood or coniferous trees can be harmed or killed by disease causing organisms called pathogens.

The Transmission of Major Tree Diseases
How tree diseases spread to other trees and the most common ways tree diseases are transmitted.

Top Five Hardwood Killing Tree Diseases

Top Five Conifer Killing Tree Diseases

Bacterial Wetwood - Prevention and Control of Slime Flux
Bacterial wetwood, also called slime flux, is a major bole rot of trunk and branches of trees. Slime flux has been attributed to bacterial infection in the inner sapwood and outer heartwood area of the tree.

Seiridium Canker on Leyland Cypress
Seiridium Cankers

Fire Blight on Ornamental and Fruit Bearing Trees
Fire Blight

Leaf ScorchTree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including leaf scorch. Here is how.

Dwarf Mistletoe - Prevention and Control
I have compiled the most common tree pests and diseases you might find in yard and forest. You can do a lot to prevent and control diseases including eastern dwarf mistletoe and lodgepole pine dwarf mistletoe. Here is how.

Winter Tree Injury
Winter tree injury is considered a non-infectious tree disease that is caused by environmental trauma. Winter tree injury also makes trees susceptible to many other diseases and insects.

Common Non-infectious Tree Diseases
I have compiled the most common non-infectious abiotic tree diseases found on trees in the yard and forest. You can do a lot to prevent and control these non-living tree diseases. Here is how.

Canker Tree Disease - Prevention and Control
I have compiled the most common conifer tree diseases you might find in yard and forest. You can do a lot to prevent and control conifer tree disease including cankers. Here is how.

Conifer Root and Butt Disease - Prevention and Control
I have compiled the most common conifer tree diseases you might find in yard and forest. You can do a lot to prevent and control conifer tree disease including root and butt disease. Here is how.

Needle Blight Tree Disease - Prevention and Control
I have compiled the most common conifer tree diseases you might find in yard and forest. You can do a lot to prevent and control conifer tree disease including needle blight. Here is how.

Needle Cast Tree Disease - Prevention and Control
I have compiled the most common conifer tree diseases you might find in yard and forest. You can do a lot to prevent and control conifer tree disease including needle cast. Here is how.

Root and Butt Rot Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including root and butt rot. Here is how.

Heart Rot Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including heart rot. Here is how.

Leaf Spot Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including leaf spot. Here is how.

Canker Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including canker disease. Here is how.

Verticillium Wilt Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including Verticillium wilt. Here is how.

Sooty Mold Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including sooty molds. Here is how.

Powdery Mildew Tree Disease - Prevention and Control
I have compiled the most common hardwood tree diseases you might find in yard and forest. You can do a lot to prevent and control hardwood disease including powdery mildew. Here is how.

Fusiform Rust or Cronartium fusiforme
Fusiform Rust or Cronartium fusiforme

Annosus Root Rot
Annosus Root Rot

White Pine Blister Rust
White Pine Blister Rust

Diplodia Blight of Pines
Diplodia Blight of Pines - a disease that kill coniferous trees in great numbers.

Anthracnose Diseases
Anthracnose Diseases

Oak Wilt
Oak Wilt

Dutch Elm Disease
Dutch Elm Disease

Armillaria Root Disease
Armillaria Root Disease

American Chestnut Blight
Information on American Chestnut Blight

The Hardwood Killer Diseases
Five diseases that kill hardwood trees in great numbers.

The Conifer Killer Diseases
Five diseases that kill coniferous trees in great numbers.

Sycamore Anthracnose Discussion
"I live in Michigan and have a huge, beautiful sycamore tree in my backyard. However, I do believe it does have the fungus Anthracnose."

Walnut Anthracnose
Walnut Anthracnose - Attacks black walnut. USDA Forest Service data.

Sudden Oak Death
Sudden Oak Death - Attacks western oaks. APHIS and Perdue University data.

Sirococcus Shoot Blight
Sirococcus Shoot Blight - Attacks northern pines. USDA Forest Service data.

Scleroderris Canker
Scleroderris Canker - Attacks red and jack pine. USDA Forest Service data.

Oak Wilt
Oak Wilt - Attacks eastern oaks. USDA Forest Service data.

Fusiform Rust
Fusiform Rust - Attacks southern pines. USDA Forest Service data

Eastern Dwarf Mistletoe
Eastern Dwarf Mistletoe - Attacks black spruce. USDA Forest Service data.

Dogwood Anthracnose
Dogwood Anthracnose - Attacks dogwood. USDA Forest Service data.

Diplodia Blight
Diplodia Blight - Attacks pines. USDA Forest Service data.

Commandra Blister Rust
Comandra Blister Rust - Attacks pines. USDA Forest Service data.

Canker-rot
Canker-Rot - Attacks southern hardwoods. USDA Forest Service data.

Cankers on Western Quaking Aspin
Cankers on Western Quaking Aspin - Attacks Quaking Aspin. USDA Forest Service data.

Brown-spot Needle Blight
Brown-spot Needle Blight - Attacks longleaf pine. USDA Forest Service data.

Beech Bark Disease
Beech Bark Disease - Attacks beech. USDA Forest Service data.

Armillaria Root Disease
Armillaria Root Disease - Attacks a multitude of conifers and hardwoods. USDA Forest Service data.

Anthracnose Diseases
Anthracnose Diseases - Attacks many eastern hardwoods. USDA Forest Service data.

Thousand Cankers Disease
A fungus called Geosmithia morbida, hosted by the walnut twig beetle, causes a new threat to black walnut by spreading thousand cankers disease.

What is a Tree Burl?
Burls are common hardwood and conifer diseases you might find in yard and forest. You can do a lot to prevent and control tree burl. Here is how.