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

What's Hot HL Issue 6

Hemlock woolly adelgid egg masses. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Roseslug sawfly damage to a rose leaf. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Roseslug sawfly larva feeding on rose leaf. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

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

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

Disease Hotline Issue 6

Fruiting bodies of cedar-apple rust galls. Photo by: Joseph O'Brien, USDA Forest Service, Bugwood.org.

Cedar-apple rust on crabapple leaf. Photo by: University of Georgia Plant Pathology Archive, University of Georgia, Bugwood.org.

Spot anthracnose on dogwood petal. Photo by: Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org.

Disease Hotline Issue 12

Cedar-apple rust on crabapple.

Cedar-apple rust on crabapple.

Cedar-apple rust on eastern red cedar.

Cedar-quince rust on juniper.

Cedar-quince rust on Chinese hawthorn.

Cedar-quince rust.

Iris leaf spot. Photos by: Bob Mulrooney, Plant Pathologist, University of Delaware.

Disease Hotline Issue 2

Cedar apple rust on juniper.



Cedar apple rust close-up.


Cedar apple rust on crabapple.



Crabapple scab on the fruit.



Close-up of crabapple scab


Crabapple scab. All disease photos taken by Bob Mulrooney, University of Delaware.