Thursday, May 7, 2009

Landscape and Nursery - Cedar-Apple Rust

The follwing is information and pictures of cedar apple rust on eastern red cedar.


The round woody galls on twigs and branches of eastern red cedar have been observed in Delaware. During wet weather these woody galls produce orange-red gelatinous spore horns with spores that infect apple and crabapple leaves. The best control on cedar is to prune out the galls to the extent possible.

Cedar apple rust gall on Eastern red cedar. Photo by Daniel H. Brown, USDA Forest Service,

Telial-stage horns of the cedar-apple rust pathogen. Photo by Joseph O'Brien, USDA Forest Service,

Information from Bob Mulrooney, Extension Plant Pathologist, UD.

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