Bacterial leaf scorch

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Bacterial leaf scorch (commonly abbreviated BLS) is a disease state affecting many crops, caused mainly by a xylem-plugging bacterium Xylella fastidiosa.[1] It can be mistaken for ordinary leaf scorch caused by cultural practices such as over-fertilization.[1]

Hosts[edit]

BLS can be found on a wide variety of hosts, ranging from ornamental trees (elm, maple, oak) and shrubs, to crop species including blueberry and almond.

Symptoms[edit]

An irregular browning leaf margin which may or may not be bordered by a pale halo.[2]

Symptoms re-occur every year, spreading throughout the tree crown, eventually killing the host plant.[2]

Vectors[edit]

Xylem-feeding leafhoppers can transmit the disease bacteria[2]

Treatment[edit]

There are no known effective treatments for BLS, consequently, removal of affected plants is recommended[2]

See also[edit]

External links[edit]

References[edit]