While fungus attacks take many forms, the two main diseases that fungus cause on cedar trees are cedar-hawthorn rust and cedar-apple rust. It's not difficult to tell these diseases apart.
The fungus Gymnosporangium globosum causes cedar-hawthorn rust on eastern red cedar and southern red cedar trees. Trees affected with cedar-hawthorn rust will produce galls for more than one season, while trees with cedar-apple rust will not.
Cedar-apple rust occurs in greater volume in states where apples are a major crop. This fungal disease only occurs where red cedar trees and apple trees grow in proximity.
Signs of Cedar-Hawthorn Rust
Affected trees develop reddish-brown growths on the leaves that eventually swell and produce spiky horns in wet weather. These galls do not cause foliage to die.
Signs of Cedar-Apple Rust
Round galls develop on cedar trees affected with cedar-apple rust. The galls develop orange protrusions in the spring but do not damage the cedar trees greatly.
Plant varieties of cedar tree that are resistant to these two rust diseases.
You can spray cedar trees with fungicide to cure a fungal infection. Check with your local county extension office to find approved fungicides before you spray.
- Photo Credit big tree image by Ritu Jethani from Fotolia.com
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