Disease Hotline Issue 12


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

Cercospora leafspot on rose. Photo provided by: Paul Bachi, University of Kentucky Research & Education Center, Bugwood.org

Cedar apple rust. Photo provided by: USDA Forest Service – Region 8 Archive, USDA Forest Service, Bugwood.org

Cedar apple rust. Photo provided by: Daniel H. Brown, USDA Forest Service, Bugwood.org

Disease Hotline Issue 21


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

Disease Hotline Issue 13


Tree with symptoms of horsechestnut leaf blotch.

Horsechestnut leaf blotch. Photos of horsechestnut leaf blotch were found at the following website: http://www.ppdl.purdue.edu/PPDL/weeklypics/9-11-06.html.

This image of Phyllosticta leaf spot was taken from: http://ohioline.osu.edu/hyg-fact/3000/3044.html

This image of red thread was found at the following website: http://www.plantpath.wisc.edu/tddl/tddl/disimg/red/plant.jpg