Horse chestnut leaf blotch. Photo by: M. Petitjean, University of Massachusetts Extension & found at: http://www.umassgreeninfo.org/fact_sheets/diseases/guignardia_leaf_blotch.pdf

Oak infested with oak anthracnose. Photo provided by: Joseph O’Brien, USDA Forest Service, Bugwood.org

Oak anthracnose on oak leaf. Photo provided by: Joseph O’Brien, USDA Forest Service, Bugwood.org

Close-up of oak anthracnose. Photo provided by: Robert L. Anderson, USDA Forest Service, Bugwood.org

Bacterial leaf scorch. Photo provided by: Randy Cyr, Greentree, Bugwood.org

Glassy-winged sharpshooter vectors Xylella fastidiosa in grape plants, the same bacteria responsible for BLS. A possible vector. Photo provided by: Reyes Garcia III, USDA Agricultural Research Service, Bugwood.org

Grass sharpshooter is also known to vector X. fastidiosa in grape plants. Another potential vector for BLS. Photo provided by: Jack Clark, University of California – Davis, Bugwood.org