Does Triple 13 fertilizer cause black spot disease in roses? My Knock Out roses were really nice before I fertilized. Now they are stricken heavily with the disease. — Lee Black spot symptoms are ...
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Black spot disease on roses
Q: I have some old rose bushes. They start out great each spring, but most summers, black spots develop on all my plants. By mid to late summer, most of the leaves are off the rose bushes, and they ...
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