Q: I recently noticed a black, tar-like patch on my tree trunk, though it’s not tacky like actual tar. Are these insect eggs? Dried sap? Do I try to scrape it off? The tree has lichen but I don’t ...

The list of diseases attacking trees in the Pacific Northwest grows every year. A pathogen new to Pierce County brings an added concern: It can injure people. A research project using citizen ...

The list of diseases attacking trees in the Pacific Northwest grows every year. A pathogen now found in Bellingham brings an added concern: It can injure people. A research project using citizen ...

The Birmingham Zoo will have to cut down and remove "at least" 75 large oak trees that have shown signs of infection by a tree fungus, Zoo officials tell AL.com. The fungus, called Hypoxylon canker ...

Q: Can you identify this for me? [The reader sent photos.] It was on two small trees I cut down. A: Your black cherry tree had a case of black knot, a common fungal disease. When a tree is infected, ...

LITTLE ROCK — The sound of raindrops on tree leaves and the little greenish-brown pellets on the sidewalk are related to a common summertime phenomenon — leaf-hungry caterpillars. “Leaf-devouring ...

I came across this tree in nearby woods recently and while I have an idea that is a burl on a cherry tree, I wondered if one of our readers who had a career in forestry could offer me more specifics ...