http://www.apsnet.org/education/LessonsPlantPath/BLS/default.htm
Article compares, Leaf Scorch due to abiotic stress with biotic stress. Lists symptoms of both.
Bacterial Leaf Scorch is a vascular disease.
BLS is one of a group of diseases caused by Xylella fastidiosa.
BLS of oak may be confused with oak wilt, another vascular disease. Like BLS, initial symptoms of oak wilt appear as scorched leaves. Unlike BLS, however, scorching appears in spring to early summer, and trees defoliate and die within several months after symptoms appear.
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