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Black spot on ALL my canes- now what?

Jessica Skelley
6 years ago

Last year we had a very rough round of black spot on our knockout roses. I didn't realize how extensive the disease had gotten until pruning this week prior to spring (we are in Deep South, so we already have new growth). I pruned very heavily this year to take out the worst parts of the canes, but am at a loss of what to do from here because they all have what I think is black spot on the remaining areas, even the old established canes. Do I cut it down completely to the ground? Do I take the bushes out completely? We have eight in a hedge that are all like this, and then two David Austin roses a few feet away that have gone miraculously unharmed. Thanks for any advice you can give!!

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