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Black spot on new rose.

PinkheartPinkheart Posts: 70
in Problem solving
Hi! I had a yellow rose that got black spot but survived maaaany years then just died. I was lucky enough to get a replacement that looks identical. As it started growing it’s new leaves,they were lush & green. I’ve had about 10+ roses. 
 It now has black spot! 
It is in the sun most of the time. It’s in a huuuuge oil drum. I water at the bottom, it’s not congested etc etc. Been removing infected leaves & binning them. Tried homemade’killer’ but it just keeps raining here. 
 Everything that should have worked, hasn’t! I’m thinking maybe I should prune it right back? If so, how far? 
Also, any idea how a New rose that’s had all the right conditions & in a new pot etc could get Black spot? No gardens near by have roses.
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  • GemmaJFGemmaJF Posts: 2,286
    I don't grow a lot of roses, so no expert, but I was told by someone who grew flowers professionally, that once you have it, you have it. It's a fungus, so the spores are literally everywhere where it has been.

    Hope someone can give a long-term solution, all I've ever done is remove the infected leaves, though some years it is bad, some not so much.
  • edhelkaedhelka Posts: 2,351
    There is no solution to blackspot, it's just a part of growing roses. Some roses are susceptible to it and will get it if the conditions are right (relatively warm and humid). You can spray with fungicides if you are willing to use them, they work in most cases, although some roses will blackspot even with a fungicide treatment. Usually, it isn't severe enough to kill a rose but it can weaken it. With fewer and fewer people willing to spray, more and more disease resistant roses are getting on the market. I would love to see the really susceptible one to disappear but it probably won't happen because many climates (dry climates) don't have problems with blackspot and a disease-prone rose can be disease-resistant and lovely in a different part of the world. If you don't want to deal with it, get a disease-resistant variety.
  • PinkheartPinkheart Posts: 70
    Thanks both of you. Any advice on whether to prune it back! It’s v straggly, no flowers and almost no leaves now!
  • Mike AllenMike Allen Posts: 208
    I have grown roses for many years.  With respect to members.  When browsing rose catalogues, gtowers, breeders and nurserymen usually provide a reasonably good account of the rose.  This usuall include colour, type, and other bits and bobs.  Then in most cases, advice is given relating to the plant's reactions to known problems.

    Perhaps in a particular case, it may say.  Susceptible to black spot.  Please give this some thought.  This grower whatever is out to sell his plants.  Think about it.

    If I may.  Speaking as a plant pathologist.  Black Spot immediately rings a bell.....ah! roses.  Black spot is is a fungal infection, that actually affects many plants, often dealt with under a different name.

    It is not noticed until the foligae, leaves display these unatractive dark blotches.  Ooops!  sorry precautions are too late.   It's like the GP saying.  Sorry.  Little Jimmy has tonsilitis.

    The plant has got it.  Paying out and buying sprays etc is one thing.  Fair do's such treatments might give some protection for a further onslaught... Please make note.  There are so many fungal diseses that affect plants.  Trust me.  We humans and the plants around us, share a similarity.  WE have skin and the outr layer is called, the epidermis.  Plants have leaves.  Here both the human and the plant epidermiss and leaves match up.  In humans.  The epidermis, the outer skin is the first contact with any fungal attack.  With plants.  The leaves compliment the epidermis.  So our plant sady has got a blast of the black spot infection.  Treatment/action.  Now is the time to act.  In humans.  The infection has to be prevented from reaching the Dermis, the under layer.  In plants.  The infection has got to be prevented fom entering the mainstream.  So removal of infected leaves.  Burn them.  Spraying might help further infection, but there is no guarantee.
  • GemmaJFGemmaJF Posts: 2,286
    Pinkheart said:
    Thanks both of you. Any advice on whether to prune it back! It’s v straggly, no flowers and almost no leaves now!
    I'm not going to be a lot of help, but hopefully you got the leaves off before it went too far. I generally then cut back hard in February each year, in the hope the plant will be rejuvenated and new growth will not be badly affected. 
  • PinkheartPinkheart Posts: 70
    Hi mike....the rose was free . I can’t afford to buy them. The original Was a gift. 
    I removed infected leaves but suspect the rest will follow. The rose will have no leaves. Do you recommend pruning it back, if so, by how much? 
  • PinkheartPinkheart Posts: 70
    Gemmajf....not all leaves gone yet. Kept indoors by days of rain, sigh! I suspect they’ll all need removing now. Not sure I can wait til February to prune back.....might just go for it. It was free after all! 
  • Lizzie27Lizzie27 Posts: 12,494
    @Pinkheart, if it's straggly and you don't like that, just prune it back to a leaf node (or one where it should be!) to a pleasing shape. Roses are quite forgiving, I cut odd bits off mine if they offend me quite often! Also just remove all the leaves with blackspot and hopefully the new growth will be okay. This highly variable weather isn't helping, here in the SW most of my roses have some black spot, some more than others. I'm more relaxed about it now.
    North East Somerset - Clay soil over limestone
  • PinkheartPinkheart Posts: 70
    thanks Lizzie27. Cheers for advice. I’d be quite relaxed if it hadn’t killed my last rose and totally defoliated this one, sniff!! I am someone with a garden that’s lush with plants.....but almost all the ones I love won’t grow for me. Courgettes are my real nemesis, only ever get about two fruit per plant...if I’m lucky, lol! 
  • Mike AllenMike Allen Posts: 208
    Pinkheart.  Our forum friends have given good advice.  As our climate is changing so fast, I'd be inclined to wait now until the rose enters it's dormant stage before any serious pruning.  A bit of a tidy up now is ok though.
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