Bacterial leaf scorch

Bacterial leaf scorch
Large pin oak (Quercus palustris) stricken with bacterial leaf scorch during leaf-out
Common namesBLS
Causal agentsXylella fastidiosa
Hoststrees and crops
Vectorsleafhoppers

Bacterial leaf scorch (BLS), or 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.

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