Just been catching up with this thread. Such a lot of beautiful rose photos. I’ve very few in flower at the moment apart from a pink flower carpet that is never out of bloom. Everything else is between flushes.
@edhelka I really like your ‘eyes for you’ rose. It looks lovely near the purple and white penstemon. Can you tell me how it performs in wet weather? Living in the North West it’s very important to me although I suppose it’s the same for you in Wales😁.
@peteS I would say it depends mostly on the rose. Some people say that HTs are less disease resistant than shrubs, I would say some are, some aren't.
Black spot is complicated. Quite often, roses can be clean and beautiful for months and then it appears almost overnight. Some roses get some spots but take long time time to defoliate, some will lose 30% of leaves, some 50%, some all of them and they quickly regrow, some won't regrow well, some get covered with spots so the leaves are completely black but don't drop them... Roses that stay healthy one year can be diseased the next year, roses resistant in one area (to one strain) can be disease nightmares elsewhere. It isn't black or white, disease-resistant or disease-prone, most roses are somewhere in between.
I like to grow some disease-prone roses because I like them enough for other reasons. HTs for cut flowers can be hidden somewhere where they aren't as visible. Defoliating shrubs can be accompanied by perennials with late summer or early autumn interest.
I get rid of a rose when it doesn't speak to my heart. Blackspot or not.
I have several HTs, most of them have average disease resistance.
@Jenny-R I like it, so far. As a semidouble, it does fairly well in rain. But it has the habit of hiding the centre (protecting the pollen and stigmas). Many semidouble roses do that, opening in the morning and when it is sunny and closing in the evening or when it is wet but I think with hulthemias, it takes away their most interesting feature. It's also quite sensitive to humidity and cloudy weather and only opens when it is really sunny.
It is a small dense shrub at the moment. I am not sure about its mature size, descriptions on various websites are inconsistent. Some of the perennials in that border will be moved when the roses get bigger.
@peteS BTW I am not sure if your HT has blackspot. I see mostly anthracnose or cercospora - I never know which one is which - the type with small spots with a lighter centre, that eventually falls out, leaving a small hole. There are at least two different fungal diseases causing small spots but not defoliating a rose. The most disease-resistant Kordes roses usually don't get blackspot but can get these. It's possible you have some blackspot there too but I am not sure from the photo.
@edhelka...thanks for that info on BS, it is indeed a complicated disease. One place where there hasn't been any black spot (yet) is on my Dusky Maiden, I just love the dark sultry reds and considering it's only been potted up a couple of months, it's been a real star, never out of flower, coped with the heavy rains admirably and is a non drooper. No scent though, although it is described as fragrant.
@edhelka thank you for the interesting info on Eyes for You. I hadn’t realised that the flowers would close up on a dull day. It is so pretty though and I’m very tempted.
I decided to photograph a disease guide... took me 5 minutes to photograph in my garden and a bit more to put together. I am no disease expert but when we are talking disease, it's good to have some pictures. Please correct me, anyone, if I IDed something incorrectly.
Rust. Small dots, orange fruiting bodies on the underside.
Powdery mildew. Powdery substance on leaves and buds.
Anthracnose (or cercospora... if anyone knows how to tell these apart, I would love to know. Google is confusing. But more probably it is anthracnose.). Spots with a lighter centre, eventually becoming a hole. Usually isn't severe enough to defoliate the rose.
The dreaded blackspot, as it manifests in different roses. Large spots with uneven edges, often spider-like or vein-like. Eventually, either yellowing around or fully covering the leave. Defoliating.
And a bonus. I don't know what this is. It has been going for some time. Affecting young leaves but not having a hole in the middle and not defoliating the rose or not quickly. Any ideas welcome. I don't know downy mildew but I think downy is quickly defoliating. Maybe anthracnose looking different on this rose. Or something bacterial or viral?
A second flush of Barkarole just cranking up. Quite a bit of black spot all over the garden now, including this.
This is one season's Etoile growth. It has just started putting on some shoots - it seems they might put on flowers. I'm really hoping the shoots won't be hugely long as it will look daft on the small arch. For a dark red rose to cover an arch - this seems to be the best choice out there - at least, that I could find. Below is Etoile with white perennial sweet peas.
Wow, great and upsetting guide @edhelka , thank you. Not that I'll need it because certain growers have pledged my rose choices are excellent for disease resistance right? Actually because of this thread alleged disease resistance has slipped down my musthaves in a rose, right from the very top of the list. For years I ignored roses because I remember the palavar of spraying and angsting from my mother. The thought that I could enjoy roses even with some disease has been very freeing. So thank you for that.
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@AlliumPurpleSensation have you thought about Dunham Massey as a rose with a link to Cheshire? It’s named after the NT estate. https://www.classicroses.co.uk/dunham-massey-shrub-rose.html
One place where there hasn't been any black spot (yet) is on my Dusky Maiden, I just love the dark sultry reds and considering it's only been potted up a couple of months, it's been a real star, never out of flower, coped with the heavy rains admirably and is a non drooper. No scent though, although it is described as fragrant.