Hawthorn in trouble

Watch Reply
More
Mark unread Print Skip to new
joannabanana Calgary, AB(Zone 3a) Aug 20, 2008

Anyone know what this is? It appeared on a few berries & leaves. I'm going to take a ladder out & hand pick off all that I see. Should I spray with anything?

Thumbnail by joannabanana
Post #5439664
Quote
ecrane3 Dublin, CA(Zone 9a) Aug 20, 2008

I would guess it's one of the Gymnosporangium species, this is an interesting group of fungi that alternate between a Juniperus species and something in Rosaceae (most frequently apple, hawthorn, or quince). Often called cedar-apple rust, juniper-apple rust, cedar-hawthorn rust, etc. Unfortunately if you have a susceptible plant and you have junipers in the area, there's really not a good way to prevent it, short of getting rid of one of the hosts (if it doesn't have them both, its life cycle is interrupted and it won't cause problems). Of course if the juniper half of the problem is in your neighbor's yard then you don't have too many options! Here's an article with more info http://www.urbanext.uiuc.edu/focus/cedarhawthornrust.html

Post #5439689
Quote

Post a Reply to this Thread

Please or sign up to post.
Back to Forum Homepage

More Trees, Shrubs and Conifers Threads

Go to all Trees, Shrubs and Conifers threads
BACK TO TOP