Need growths on cedar tree branches identified

Asked April 25, 2018, 3:29 PM EDT

What are these growths on the branches on our cedar tree? Included are photos from a couple months ago and now.

Carroll County Maryland

3 Responses

Good Morning!


This is cedar apple/pear/quince rust (a Gymnosporangium rust disease) and is very common on cedar in the springtime. Members of the genus Juniperus (like Eastern red cedar and juniper) are a host of one of the life stages, like you are seeing now. The fungus doesn't really cause harm to cedars, but the spores from this stage are spread to apple, pear, quince, hawthorn, and related species where they can damage leaves and fruit. It is possible to prune out the fungus on the branches, but on large trees there would almost certainly be infections on areas that are out of reach for pruners. There is no practical way to manage it with chemicals. The best way to manage this disease is to plant varieties of apple, hawthorn, pear, ect that are resistant to rust. Again, this will not damage the cedar.

Check out the links below for more information.


Thank you so much!