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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comMy roses have black spot. What is it? How do I get rid of it?
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[1] http://www.rosemania.com: http://www.rosemania.com
[2] https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm: https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm
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1 Comment To "My roses have black spot"
#1 Comment By roseman On 06/29/2012 @ 7:13 am
Black spot is a fungus that attacks many rosebushes. Once it has left its mark on the foliage, it will not go away until new foliage comes forth. The best fungicide I have found to kill it once it has gotten its hold on things is called Mancozeb. I get it from http://www.rosemania.com [1] . Tell them Roseman Stan sent you. Here is an article about it for you too: https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm [2]
I keep my rosebushes sprayed with a fungicide called Green Cure from the first leaves opening up in spring to the end of the season. I spray them every three to four weeks with it. Depending on weather conditions of course. If it is higher in humidity or dampness out, I spray every 7 days.