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Hi Paul,
I've used Messenger on my roses here in Spokane Washington and feel that it was valuable. I'm not good at taking before and after photos, but feel that my roses suffered less from diseases as a result. Northland Rosarium here in the area, and the local American Rose Society continue to compare notes about the product. I visited an organic garden in the Seattle area that uses Messenger, and I was very impressed that their roses did not seem to be suffering from blackspot, a common malady in that humidity. Wish I had something more conclusive to say.
Wish I could be more helpful. I haven't been a very observant gardener lately. It is absorbed through the leaves. I would love to know what you observe. Thanks for the article!
