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According to author and horticultural professor Jeff Gillman, who has conducted extensive research on blackspot remedies, a spray composed of one part milk and two parts water is the best answer to the disease. He says this simple solution, if applied weekly, will control blackspot as well as any synthetic fungicide, including Chlorotalonil.
While inspecting my roses the other day, I discovered that some of the shrubs (like ‘Mary Rose,’ pictured above) are showing signs of “blackspot.” Details about this insipid fungal disease, which, according to extensive research, can be controlled with a weekly spraying of milk and water.
Rose...pretty & delicate...just like a woman...but beware of the thorns lest you get pricked ~ Zeta M Mood | Photo by cate on flickr