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 ...

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 the branches of your trees and shrubs are bare in winter, you have an opportunity to spot cankers that might be hidden by leaves in summer. A canker is an area of disease in the wood of a plant. ...

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 ...