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

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

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 ...

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

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

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Bradford pears have notoriously weak crotches (branch angles). Think of your index and middle fingers forming a “V” for ...

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 ...

Often trees with decaying wood in their trunks are beginning to lose strength. They can come tumbling down without warning.