Disease Hotline Issue 25

September 23, 2011 in Disease

Photos of Septoria leaf spot, Cercospora leaf spot, fairy rings, and stink horns have all been posted previously.  Please use the search function to locate these images.

Disease Hotline Issue 12

June 18, 2010 in Disease


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 4

April 23, 2010 in Disease


Black spot on rose. Photo provided by: Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org

Cercospora leaf spot on rose. Photo found at: http://edis.ifas.ufl.edu/LyraEDISServlet?command=getImageDetailℑ_soid=FIGURE%201&document;_soid=PP267&document;_version=42330

Kabatina blight on juniper. Photo found at: http://urbanext.illinois.edu/hortanswers/detailproblem.cfm?PathogenID=20

Disease Hotline Issue 20

August 14, 2009 in Disease


Alfalfa mosaic virus on potato. Photo provided by: Howard F. Schwartz, Colorado State University, Bugwood.org

Cercospora leaf spot on Bigleaf Hydrangea. Photo found at: http://www.aces.edu/pubs/docs/A/ANR-1212/

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

Daylily leafstreak. Photo found at: http://www.umass.edu/umext/floriculture/fact_sheets/pest_management/daylily_rust_streak.htm

What’s Hot HL Issue 23

September 15, 2008 in Caterpillars, Disease, Plant pathogens


Cercospora leafspot on rose. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Pyracantha scab on fruits. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Puss caterpillar. Photo by: Gerald J. Lenhard, , Bugwood.org

Puss caterpillar. Photo by: Lacy L. Hyche, Auburn University, Bugwood.org

Plumbago foliar nematode. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Disease Hotline Issue 23

September 15, 2008 in Disease


Cercospora on Sourwood. Photo by: Bob Mulrooney, Plant Pathologist, University of Delaware

Oak anthracnose from a distance. Photo by: Joseph O’Brien, USDA Forest Service, Bugwood.org

Oak anthracnose. Photo by: Robert L. Anderson, USDA Forest Service, Bugwood.org

Disease Hotline Issue 24

September 7, 2007 in Disease

Cercospora on Sourwood
Photo by Bob Mulrooney, University of Delaware

Walnut Anthracnose
Photo from the University of Minnesota Yard and Garden Line News

Tar Spot on Maple
Photo by Steven Katovich, USDA Forest Service, Bugwood.org

Disease Hotline Issue 19

August 3, 2007 in Disease

Microscopic close-up of Cercospora leaf spot on Endless Summer big leaf hyrdrangea (Hydrangea macrophylla ‘Bailmer’); note, purple halo around spot.

Photo by Missouri Botanical Garden, Kemper Center for Home Gardening, IPM

Cercospora leaf spot on lower leaf surface of Endless Summer big leaf hyrdrangea (Hydrangea macrophylla ‘Bailmer’).
Photo from the Missouri Botanical Garden, Kemper Center for Home Gardening, IPM
Cercospora leaf spot on upper leaf surface of Endless Summer big leaf hyrdrangea (Hydrangea macrophylla ‘Bailmer’).
Photo from Missouri Botanical Gardens, Kemper Center for Home Gardening, IPM

Cercospora on Rose
Photo by Jody Fetzer, New York Botanical Garden, Bugwood.org

Black Spot on Rose
Photo from the Iowa State University Plant Disease Clinic
Black Spot on Rose
Photo from the Iowa State University Plant Disease Clinic

Mutinus caninus, a type of stinkhorn, growing on mulch
Photo by Paula Flynn, Extension Plant Pathologist, Iowa State University