- I have really bad black spot on a rose (Arthur Bell) that never suffered it much before. I'm a bit concerned as even the stems have spots. If I treat it next spring, will the spots on the stems go away? If not, what should I do?
In London. Keen but lazy.
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Black spot can be controlled by making sure you get rid of all the foliage that falls in Autumn, but don't compost it. Burn it or put it in the dustbin. This will get rid of the source of the disease. Some years are worse for black spot and it also depends on the rose. I have one in a pot that suffers badly some years but is almost spot free at other times and this year looks almost super healthy, but the leaves are beginning to get spotty now the season is coming to an end. As to the stems, the advice from the RHS is to, "Prune out all stem lesions in spring before leaves appear".
Thanks Ceres but unfortunately all stems are affected.. it's had a good innings. If it doesn't recover I will buy another next year. It has a lovely smell and was generally quite tolerant.
B3 you need to cut out the affected stems when carrying out the late winter/spring prune. If you leave them the black spot will return. You can be brutal and take out the stems right to the base if necessary. New growth will come from the crowns and a regime of spraying right from the start combined with feeding mulching and watering will help.Spray the whole plant and ground around the plant and keep the ground free of any detritus. Mulch feed and water and stand back. They should be better after that. A well fed and watered rose will resist infection.
Thanks Dave. There's a few flower buds left. Will prune it right down when they've finished
BTW , Dave, will the black spot be in the woody bits as well?
Couldn't bear to throw Arthur out . Pruned it fairly hard and have sprayed it a couple of times this year. It seems to be doing well. Even the spots on the branches seem to be fading - fingers crossed