The best fungicide I have found to stop black spot in its tracks is called Mancozeb. I get it from http://www.rosemania.com . A bottle of it lasts a long time so the price is not that bad. I use it if I have black spot get started and cannot gain control. As my main fungicide I use a product called Green Cure. I have zero problems with any funguses if I keep the rose sprayed with it at no more than 14 day intervals. Two scoops of it per gallon. A little scoop comes in the tub of product and you use the big end of the scoop.
Answered on June 11, 2012
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