Cedar Apple Rust Gymnosporangium juniperi-virginianae Schweinitz  

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This parasitic fungus with two hosts is a major agricultural pest. Galls on stems of Eastern Redcedar trees produce jelly-like orange horns that bear spores. These spores infect apple leaves. In turn, the small dense yellow spore case clusters on apple leaves disseminate spores that produce the galls found on cedars (J. Solem, pers. comm.).

There are 93 records in the project database.

GAAL WA FR CL MO HO BA BCHA CE PG AA CV CH SM KE QACN TA DO WISO WO 
Cedar Apple Rust in Talbot Co., Maryland (3/26/2016). Photo by Dan Small. (MBP list)

Cedar Apple Rust in Montgomery Co., Maryland (5/11/2015). Photo by Bonnie Bell. (MBP list)

Cedar Apple Rust in Montgomery Co., Maryland (4/2/2017). Photo by Robert Ferraro. (MBP list)

Cedar Apple Rust in Cromwell Valley Park, Baltimore Co., Maryland (5/1/2013). Photo by Benjamin DeHaven. (MBP list)

Cedar Apple Rust on a Crab Apple leaf in Howard Co., Maryland (8/7/2016). Photo by Richard Orr. (MBP list)

Cedar Apple Rust in Frederick Co., Maryland (5/9/2015). Photo by Mark Etheridge. (MBP list)

Cedar Apple Rust in Prince George's Co., Maryland (4/30/2016). Photo by Barbara Thurlow. (MBP list)

Cedar Apple Rust in Howard Co., Maryland (5/1/2013). Shown here are mature spore-bearing structures on Eastern Redcedar host. Photo by Joanne Solem. (MBP list)

Cedar Apple Rust in Calvert Co., Maryland (5/5/2016). Photo by Tyler Bell. (MBP list)

Cedar Apple Rust in Anne Arundel Co., Maryland (5/2/2016). Photo by Tyler Bell. (MBP list)

A Cedar Apple Rust in St. Mary's Co., Maryland (5/1/2013). Photo by Patty Craig. (MBP list)

A Cedar Apple Rust in Calvert Co., Maryland (5/16/2014). Photo by Bill Hubick. (MBP list)

Cedar Apple Rust (winter gall) on Eastern Redcedar in Washington Co., Maryland (12/27/2014). Photo by Jane Hill. (MBP list)

Cedar Apple Rust in Harford Co., Maryland (1/16/2017). Photo by Dave Webb. (MBP list)

Cedar Apple Rust in Worcester Co., Maryland (2/20/2016). Photo by Bill Hubick. (MBP list)

Cedar Apple Rust on Eastern Red Cedar in Calvert Co., Maryland (3/18/2017). Photo by Bill Hubick. (MBP list)

A Cedar Apple Rust gall in Worcester Co., Maryland (3/25/2017). Photo by Ashley Bradford. (MBP list)

Overwintering Cedar Apple Rust gall in Howard Co., Maryland (2/3/2012). Photo by Robert Solem. (MBP list)

Cedar Apple Rust (overwintering gall) in Montgomery Co., Maryland (11/22/2014). Photo by Jane Hill. (MBP list)

Cedar Apple Rust aeciospores collected in Howard Co., Maryland (8/7/2016). Thick-walled, 5- to 7-sided, brown; measured 21.1-25.4 X 18.3-20.5 microns. Photo by Robert Solem. (MBP list)


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