This has been a great year for established roses in my garden, not so much for newer ones trying to grow. The reason due to lower humidity, lack of rain, and continuing dry sunny conditions means no black spot, since June. There is hardly a leaf on any of my roses that show any discolourations, I don't think I've ever known a year like it for disease free foliage.. A few have shut down, bloom wise, but most are holding up.. these are some examples..
'Marie Nabonnand'.. I would normally expect to see some BS on this in August.. it has just finished a flush of bloom and appears to have shut down for now.. 'Indigo'.. remarkably healthy considering the type.. 'Wild Rover'..  'Kathleen Harrop'.. older leaves.. ..newer leaves.. 'Scented Garden'.. still full of flowers too.. 'Forever Royal'.. likewise..
A Midsummer Night's Dream and Jubilee Celebration are spectacular!
Heritage arrived. The bees were attacking it before it was out of the box! Last frivolous purchase this year, therefore pleased it is so lovely. Dee-Lish, perfect.
Yes I’ve had remarkably little blackspot and insect damage too, but I’m also seeing a lot of nutrient deficiencies in foliage this year which I think is caused by a variety of factors. Leaves unable to photosynthesise properly due to weather - very dry, hot air, burnt leaves etc. - has been a major factor.
I also have a very high proportion of organic matter as a very thin layer of alkaline clay soil means having to grow in raised beds, effectively super-sized pots. The latter may be causing the manganese deficiency I’m seeing, which has a knock-on effect on photosynthesis and nitrogen metabolism. Having to rely on local fertilisers which give me NPK but don’t often contain other vital nutrients such as magnesium, manganese, copper, iron, boron, molybdenum doesn’t help.
Next year I’m going to have to smuggle in a job lot of topsoil and DA rose fertiliser I think!
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
Glad to see such spectacular roses still. It is too hot for the blooms here, although I've pushed them into the shade (still 31DegC there today, hotter to come) many are crisping anyway and even those that aren't are not lasting. I am a bit gutted as everything was coming on so well for the family wedding shortly.
Pushing them this far under the balcony was enough last heatwave now the sun is definitely lower and reaching further under the overhang so I've moved them further back. The scent under there is fabulous.Utopia, Timeless Purple, Chandos Beauty and Proper JobNew ZealandDames de Chenonceau
Please help! I think i am losing all my roses, I am at a loss... heartbroken. Absolutely all of them have been hit with this disease. It starts with leaves yellowing and getting all sorts of spots (but it isn't black spot), then on closer inspection the cane with those leaves shows yellow discoloration in some parts, which can also get swollen, and then brown/black bits like canker. Some leaves/canes die back completely. I noticed strange white spots along the stems, they are scattered and not fluffy, if i rub them with my nail they easily fell off, I don't know if they are alive or not.Â
Today i also discovered some white threads on the underside of a few leaves, i don't know if it's related or not.
 I have tried to cut away the diseased canes, but all my roses are 1, a few 2 years old and i don't have many canes to rely on😠Soon there won't be anything left... In most cases the diseased stem shows symptoms right at the bottom too, so i have to cut it all the way down to the bud union... With 4 roses, I had to cut everything down, nothing left, I don't know if there will be new shoots growing or not.Â
Someone said it might be downy mildew, i sprayed them with Aliette but no improvement so far. Or is it stem canker on all roses? How is it possible? Should i try another systemic fungicide? I have fertilized and watered them, but nothing seems to help. Maybe my roses adventure will finish before it has even startedðŸ˜
Gosh, that's terrible @murasaki I've never seen anything like that before, apart from the obvious canker, there seems to be multiple issues.. I would think you would need a plant pathologist to get to the bottom of what's wrong there..
I could only suggest cutting back to any healthy wood, even right to the base if necessary and hope they recover.. otherwise I wouldn't know, I'm sorry..Â
Heartbroken to see those infected stems @murasaki. I don't know either what is happening to them. As @Marlorena says, I would cut away the affected stems and hope they recover. 🤞
Oxford. The City of Dreaming Spires.
And then my heart with pleasure fills,
And dances with the daffodils (roses). Taking a bit of liberty with Wordsworth
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A few have shut down, bloom wise, but most are holding up.. these are some examples..
'Marie Nabonnand'.. I would normally expect to see some BS on this in August.. it has just finished a flush of bloom and appears to have shut down for now..
'Indigo'.. remarkably healthy considering the type..
'Wild Rover'.. Â
'Kathleen Harrop'.. older leaves..
..newer leaves..
'Scented Garden'.. still full of flowers too..
'Forever Royal'.. likewise..
Heritage arrived. The bees were attacking it before it was out of the box! Last frivolous purchase this year, therefore pleased it is so lovely.
Dee-Lish, perfect.
I also have a very high proportion of organic matter as a very thin layer of alkaline clay soil means having to grow in raised beds, effectively super-sized pots. The latter may be causing the manganese deficiency I’m seeing, which has a knock-on effect on photosynthesis and nitrogen metabolism. Having to rely on local fertilisers which give me NPK but don’t often contain other vital nutrients such as magnesium, manganese, copper, iron, boron, molybdenum doesn’t help.
Next year I’m going to have to smuggle in a job lot of topsoil and DA rose fertiliser I think!
'Rosomane Janon' looks quite nice.  'Domaine de Chantilly'.. might ball in rain I imagine, not that we get any now..
Butterflies are scarce this year, I've only seen a few..
I noticed strange white spots along the stems, they are scattered and not fluffy, if i rub them with my nail they easily fell off, I don't know if they are alive or not.Â
Today i also discovered some white threads on the underside of a few leaves, i don't know if it's related or not.
 I have tried to cut away the diseased canes, but all my roses are 1, a few 2 years old and i don't have many canes to rely on😠Soon there won't be anything left...Â
In most cases the diseased stem shows symptoms right at the bottom too, so i have to cut it all the way down to the bud union... With 4 roses, I had to cut everything down, nothing left, I don't know if there will be new shoots growing or not.Â
Someone said it might be downy mildew, i sprayed them with Aliette but no improvement so far. Or is it stem canker on all roses? How is it possible? Should i try another systemic fungicide? I have fertilized and watered them, but nothing seems to help.Â
Maybe my roses adventure will finish before it has even startedðŸ˜
I could only suggest cutting back to any healthy wood, even right to the base if necessary and hope they recover.. otherwise I wouldn't know, I'm sorry..Â