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 ...

If you take a close look at some of the more established trees in your landscape, you may notice something you cannot seem to describe – it may look to you like a kind of fungus on your tree trunk. Is ...

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 ...

If you have cherry or plum trees, now's a good time to check for a disease called black knot fungus. The fungus can go unnoticed with summer foliage but is apparent when trees are winter-bare. Also ...

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Bark beetles may use receptors in their antennae to detect and feast on fungus-infected trees. The Eurasian spruce bark beetle (Ips typographus) – found in Europe, Asia and some parts of Africa – ...

Spruce bark is rich in phenolic compounds that protect trees from pathogenic fungi. A research team at the Max Planck Institute for Chemical Ecology in Jena investigated how these plant defenses ...