Q: I don't know what this is on my oak tree, but is it anything I should be concerned about (see reader's photo)? Should I spray with something? A: Unfortunately, I suspect your tree has hypoxylon ...

When I started my horticultural career in New Orleans back in 1980, my memory of growing citrus seems so easy. White flies and other sucking insects and the sooty mold they caused were the only major ...

Hypoxylon canker in trees is a scary-sounding thing, right? It is a fungal disease that is common on many hardwoods. An opportunistic fungus, Hypoxylon atropunctatum, causes it. Red oaks are more ...

HARRISBURG, PA. -- Thousand Cankers Disease has been detected for the first time in Pennsylvania, and a quarantine restricting the movement of wood from Bucks County and other states known to have the ...

HOUSTON, Texas (KTRK) -- A new effort to save citrus trees in Texas began in the Houston area today as an infection is threatening the citrus industry across the state. The infection is called citrus ...

Q: I have some questions about a willow tree disease. A customer purchased some golden willows from us. Since planting them, he has found some glossy black patches on the bark. The patches were not ...

European canker, caused by the fungal pathogen Neonectria ditissima, presents a significant challenge to apple production across temperate regions. The disease manifests as cankers on trunks and ...

We saw some dieback in trees coming out of winter. In some cases, it is environmental stress from drought stress and winter temperature extremes. It may also be a canker disease. Cankers infect trunks ...