Lichens are a combination of algae and fungus that often appear as white or gray blotches on the bark. They make their own food using the sun's rays so they don't feed on the tree and don't harm it.

A native Pennsylvania hardwood tree is facing extinction. Beech trees are being attacked by two separate diseases – one moves ...

A deadly new oak-tree disease can be prevented by pruning them in the dormant season (if needed) instead of spring or summer.

Strolling through certain neighborhoods or rural landscapes, you might encounter an unusual sight: trees with their lower ...

Ten years ago, a mysterious new disease was found sweeping through Hawaii’s native ‘ohi‘a forests, killing off the foundation ...

Whether it be from damaging weather conditions, diseases, fungi or insect infestations ... tissue that serve the purpose of supporting the weight of the tree and the formation of bark. Dr. Kristen ...

That disease takes out entire large limbs of the American sycamore (plane tree) in a season. And yes, the bark is stunning.

Dear Neil: What is wrong with my live oak? I hope it’s not a disease, since I have five others in my yard, and I don’t want ...

This follows laboratory tests which proved it to be 85 per cent effective in combating the disease. The drug, derived from the bark of the African bush willow tree, has been shown to work by ...

Oak wilt is a fungal disease that can weaken white oaks and kill red oak ... Once a tree is infected, the fungus may fruit, ...

Since then the disease has killed billions of elms around the United States and abroad, Held said. Spread by trees whose roots touch each other and by bark beetles that carry spores from the tree, the ...