Bacterial leaf scorch
| Bacterial leaf scorch | |
|---|---|
Large pin oak (Quercus palustris) stricken with bacterial leaf scorch during leaf-out | |
| Common names | BLS |
| Causal agents | Xylella fastidiosa |
| Hosts | trees and crops |
| Vectors | leafhoppers |
Bacterial leaf scorch (commonly abbreviated BLS, also called bacterial leaf spot) is a disease state affecting many crops, caused mainly by the xylem-plugging bacterium Xylella fastidiosa. It can be mistaken for ordinary leaf scorch caused by cultural practices such as over-fertilization.