Most Damaging Forest 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.

Softwood or coniferous trees can be harmed or killed by disease causing organisms called pathogens.

How tree diseases spread to other trees and the most common ways tree diseases are transmitted.

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 Cankers

Fire Blight

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.

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 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

Annosus Root Rot

White Pine Blister Rust

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

Anthracnose Diseases

Oak Wilt

Dutch Elm Disease

Armillaria Root Disease

Information on American Chestnut Blight

Five diseases that kill hardwood trees in great numbers.

Five diseases that kill coniferous trees in great numbers.

"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 - Attacks black walnut. USDA Forest Service data.

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

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

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

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

Fusiform Rust - Attacks southern pines. USDA Forest Service data

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

Dogwood Anthracnose - Attacks dogwood. USDA Forest Service data.

Diplodia Blight - Attacks pines. USDA Forest Service data.

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

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

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

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

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

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

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

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

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.