Griffith Buck Rose Blackspot susceptibility
For those interested, I assayed my Griffith Buck roses for blackspot and posted the results on my blog today; 22 Buck roses that are 2 years or older in my no-spray garden here in Kansas. If you have information on other Buck roses, please post in the comments on the blog so everyone can see. I plan to do the Canadian releases next Monday and my OGR's the Monday after that.
Here is a link that might be useful: Garden Musings blog; Blackspot on Buck roses