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Discussion id : 147-085
most recent 6 AUG SHOW ALL
 
Initial post 29 JUL by murasaki
Can you please tell me what disease this is and if i am dealing with one or two diseases at the same time? The symptoms seem to point to downy mildew and stem canker. But I have never encountered a description of the white circles which always appears on the sick canes. They drive me crazy. Just a few, and not grouped together. I can scrape them off with my fingers easily. Then the cane becomes yellow and develops cankers. At first, the leaves might not show symptoms, or they have different kind of symptoms like in the pics. It affects all canes, old and young. Oh, and sometimes the base of the leaflet develops a dark growth around it. I think the problem has started with a diseased potted rose I have brought into the garden last year. The symptoms appeared by the end of july and august. I had to cut most roses to the ground, then sprayed with fungicide. In spring, they rebounded nicely and I was happy, but now the same thing is happening (at the same time as last year) and the decline is very fast. Have I been blessed with the two most dreaded diseases at the same time? It looks like I will lose all my roses to this and it's heartbreaking. Almost all the roses are affected, in different parts of the garden.
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Reply #1 of 3 posted 1 AUG by Johno
Based on your photos the small white dots I assume is scale which is easily treated by eco-oil or whatever the equivalent product is for your country. The leaves are showing Black Spot (Photos 3, 4, 8) and the last image is what I would expect to see with Spider Mite. Spider mite number increase rapidly following warm weather.
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Reply #2 of 3 posted 6 AUG by murasaki
Thank you so much for replying! I thought about scale too, but the puzzling thing is that the white dots appear singly on the canes, sometimes 2 or 3, but often at great distances one from another. And there is always a canker, spiral streaks or a swelling of the cane in their proximity, it can't be just a coincidence! I think I found the answer, though: I think the white dots are the eggs of the rose stem girdlers, Agrilus Cuprescens. It seems I have quite an infestation :-( And I think I managed to find the larvae in one of the swellings. It seems there is nothing to be done but destroy all the canes, which means I will lose more roses because my roses are all young and they don't have many canes to begin with :-(
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Reply #3 of 3 posted 6 AUG by Johno
Luckily the beetle is not present in this country. I had to google it to find out more information. Control is only possible at the adult beetle stage with insecticides. Have you seen evidence of the beetle and its leaf chewing habit? I can only suggest cutting back your roses to healthy growth, check the end of the stem for larva presence, burn cuttings, and apply insecticide when the adult beetle is present. You may have to check your roses daily. I found this fact sheet from Utah State University to be useful:

Google - digitalcommons.usu.edu/extension_curall/773/

Maybe one of our American members with experience of the Rose Stem Girdler beetle could comment.
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Discussion id : 56-739
most recent 21 OCT 12 SHOW ALL
 
Initial post 18 AUG 11 by Re
Help me please. help me. Ho molte delle mie rose infestate di oidio e non riesco a debellarlo. Le ho trattate da un paio di mesi con vari prodotti specifici...ma senza grandi risultati.....alcune si sono riprese (poche), mentre altre come la Mme alfred carriere e reine victoria non fioriscono più, e le foglie nuove, in pochi giorni sono gìà attecchite dalla malattia; alcune altre mi sono persino morte. Usando i prodotti ho stressato molto tutte le mie piante di rose che stentano a rifiorire. Vi prego di aiutarmi a trovare un rimedio e chiedo tra le altre se dovrei tagliare (e di quanto?) i rami che sono infestati dalla malattia?
Grazie
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Reply #1 of 22 posted 19 AUG 11 by jedmar
The hot and moist weather now is especially conducive for powdery mildew. I collect foliage which is strongly affected and spray new foliage with a mixture of 10% milk and 90% water (plus a drop of olive oil on a liter - to reduce surface tension of the droplets). Spraying is best early in the morning and not in full sun. If you have so much powdery mildew, you will have to repeat this regularly.

Il clima caldo e umido è oggi particolarmente favorevole per l'oidio. Raccolgo fogliame che è fortemente influenzata e spray fogliame nuovo con una miscela di latte 10% e 90% di acqua (più una goccia di olio d'oliva in un litro - per ridurre la tensione superficiale delle gocce). Spruzzo è meglio la mattina presto e non in pieno sole. Se si dispone di così tanto oidio, si dovrà ripetere regolarmente.
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Reply #2 of 22 posted 20 AUG 11 by Re
Grazie per aver risposto, io vivo al sud dell'Italia dove il clima è particolarmente umido. oltre a raccogliere il fogliame dovrei accorciare anche i rami intaccati???? il mix che mi hai consigliato ogni quanti giorni lo devo spruzzare??? tieni conto che molte foglie sono ancora sui rami ma presentano nella parte inferiore della foglia, secchezza (se vuoi posso inviare una foto). Credo che sia oidio (?) anche se le piante (e sono tante) non presentano più la classica muffa bianca, ma le foglie come ho precedentemente detto, sono diventate, nella parte inferiore, color marrone (sembra come ci siano delle ragnatele). Aspetto con interesse una tua risposta visto che sono molto sfiduciato in quanto molte delle mie rose presentano questo problema (alcune sono già morte).
Grazie
Renzo
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Reply #3 of 22 posted 21 AUG 11 by jedmar
Renzo, you do not have to cut off the affected branches. Spraying once every morning for some period (even a couple of weeks) should show some success: New foliage can then develop. Do not despair, even if this year is catastrophic, roses develop some immunity in the next years.

Renzo, non c'è bisogno di tagliare i rami colpiti. Spruzzare ogni mattina per un certo periodo (anche un paio di settimane) dovrebbe mostrare un certo successo: foglie nuove possono poi svilupparsi. Non disperate, anche se quest'anno è catastrofica, rose sviluppare una certa immunità nei prossimi anni.
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Reply #4 of 22 posted 22 AUG 11 by Re
Ciao, ho portato alcune foglie ad un vivaio e mi hanno detto che potrebbero esserci anche degli acari (nella parte inferiore delle foglie sembra come ci siano delle ragnatele) e trattero le piante con un acaricida (miro della Bayern). Grazie comunque per i consigli, ti terrò aggiornato sui risultati.
A presto
Renzo
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Reply #5 of 22 posted 15 SEP 11 by Re
Ciao
volevo informarti che il problema Oidio è stato quasi del tutto isolato. In queste settimane, tra le altre ho dovuto conbattere con i ragnetti rossi che avevano infestato molte piante. Adesso spero, di aver risolto questi problemi, le rose stanno rifiorendo con buona vigoria e ti ringrazio per i tuoi buoni consigli.
T'invio in allegato la foto di una rosa non trovo il nome, Puoi aiutarmi???
Grazie Renzo
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Reply #6 of 22 posted 15 SEP 11 by jedmar
Can anyone help Renzo with identification of this rose?
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Reply #7 of 22 posted 16 SEP 11 by Kim Rupert
The flower looks like About Face. http://www.helpmefind.com/gardening/l.php?l=2.37356 I don't read the language the request is posted in. Might it be of the appropriate vintage?
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Reply #8 of 22 posted 16 SEP 11 by Re
thank you for responding, but, even if the colors are very similar, I do not think that corresponds with About Face, About Face it when the flower opens is fairly flat, while the flowers of this rose is still erect. If you continue to help me I would be grateful, because I have many roses anke unknown in my garden, and I want to give names.
thanks
Renzo
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Reply #9 of 22 posted 16 SEP 11 by Kim Rupert
You're welcome Renzo, I'll watch and comment as I can, but being in Europe, you have access to literally hundreds of roses I shall never see as they aren't brought into the US. The best I can hope to offer would be suggestions of the possibly two thousand varieties I have either grown or sold in my work. Kim
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Reply #10 of 22 posted 16 SEP 11 by Kathy Strong
I agree it's not About Face. About Face has distinctive grey-green (ugly) foliage and tons of thorns, both of which are missing from your photo. Belle Epoque would be as close as I could come, but I also see (I think) more petals on your rose than on that one.
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Reply #11 of 22 posted 16 SEP 11 by Kim Rupert
Plus, here, Belle Epoque was far less dense or saturated color, more pastel. And it never developed any kind of growth I could call "vigorous". Kim
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Reply #12 of 22 posted 16 SEP 11 by RoseBlush
Renzo, since you are a premium-member of HMF, you can use the ADVANCED SEARCH feature to help you identify some of the roses in your garden by entering more than one plant characteristic and narrow your search for identification. For example, if you know the rose is a hybrid tea, you can select CLASS and then tick the HYBRID TEA box, then click CONTINUE. Then if you know your rose is "orange", you can select COLOR and tick the box for ANY ORANGE or a specific orange color like "orange-red". You can continue to add more characteristics to narrow the search. However, if you add too many characteristics, you may not get a large enough search results. You can always refine your search by adding and deleting characteristics.

Please note, HMF has evolved over time and many of these characteristics were not entered when the roses were first added to the database, but we are working to add them to the roses that were entered before the characteristic enhancements were put in place to make the ADVANCED SEARCH feature more useful.

Smiles,
Lyn
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Reply #13 of 22 posted 16 SEP 11 by Re
Thank you for work, I do not think it neanke of Belle Epoque. I'm sorry but I tried to use search, as you advise me, but I can only put a few signs i am a novice on the knowledge of this beautiful plant, and the result is always negative. I will still tentativi.Pubblico also photos of other unnamed roses and would like to baptize them and I would be grateful if someone could help me do it.
thanks
Renzo
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Reply #14 of 22 posted 16 SEP 11 by RoseBlush
Renzo...

Great ! I was hoping you would keep trying to work with the ADVANCED SEARCH to identify your other roses. It's a good tool to use to narrow down the possibilities of an indentification.

I am certain members of the rose community will help, too.

Smiles,
Lyn
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Reply #15 of 22 posted 17 SEP 11 by Jay-Jay
The first rose MIGHT be Belle Époque from Fryer...... when the petal-count matches.
The colours of this rose match that of the one in my climate/garden.
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Reply #16 of 22 posted 17 SEP 11 by Re
Hello Jay-Jay. Belle Epoque would be very similar, but I also see (I think) plus rose petals on my roses Belle Epoque. In addition, Belle Epoque, the color has far less dense or saturated, more pastel. My plant is robust, has few thorns and blooms throughout the season with solitary flowers.
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Reply #17 of 22 posted 17 SEP 11 by Jay-Jay
Hello Renzo, mine isn't pastel at all, very saturated! And a good example is this photo From Margaret MacLean: http://www.helpmefind.com/gardening/l.php?l=21.27928
I just checked my plant for prickles: only the first 40 cm above groundlevel have some thorns, but higher no, or almost no one.
The canes are green, and the height (second season and pruned like a HT) is 1.60 m.
Flowers are mostly single on long stems.
HMF description says: very vigorous!!!
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Reply #18 of 22 posted 17 SEP 11 by Re
Hello, it's true the picture is very similar to mia.rosa. When I see you are advised to research I wrote about Belle Epoque Rose and he appears as a hybrid 4 BELLE EPOQUE you with photos that looked like my nos. I think it's just that even though a lot has no scent. I would like to ask why can not my rose sciudersi completely, the petals, in fact, remain fairly closed (see my photo) and so tend to become discolored.
thanks
Renzo
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Reply #19 of 22 posted 4 NOV 11 by Jay-Jay
Would it be possible, that this rose is Remember Me = Rose d'Amour?
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Reply #20 of 22 posted 6 NOV 11 by Re
Hello Jay-jay,
as you suggested with the posted 17 - September is definitely the first photo belle epoque.
The 2th and 3th picture in your opinion can be Coral Bay??
Even if my rose is not very fragrant.

thanks
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Reply #21 of 22 posted 6 NOV 11 by Jay-Jay
Okay Renzo, I misunderstood that about Belle Époque. But Coral Bay I don't know, because I've never seen that rose.
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Reply #22 of 22 posted 21 OCT 12 by Jay-Jay
I react on: Reply #5 of 22 posted 15 SEP 11 byRenzo...
It might be Remember me.
At this moment (fall) it has that same colour as on this picture and is really a look-alike.
I plucked the rose, it's on a vase and I'll try to photograph it tomorrow.
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Discussion id : 19-786
most recent 23 JUN 07 HIDE POSTS
 
Initial post 21 JUN 07 by Kerri Spencer
My miniture roses looked good and the blooms were amazing, but now the leave look dull and some very yellow. What is the problem?
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Reply #1 of 1 posted 23 JUN 07 by Wendy C
If you could post pictures, that would be most helpful.

Spider mites can cause what you are describing. Tap the leaves over a piece of white paper, it little specs appear, you have mites. Spray the undersides of the leaves every day for about a week, and then every few days after that to keep them at bay.

Downey Mildew can be brought into tow with Captan. Remove all effected foliage and spray them according to the directions for the product you chose.
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Discussion id : 2-717
most recent 30 JUN 03 HIDE POSTS
 
Initial post 30 JUN 03 by Anonymous-797
my roses have little white specks, sticky and yellow leaves. what should i be doing?
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Reply #1 of 1 posted 30 JUN 03 by The Old Rosarian
Mildew is fairly easy to get rid of as any rose fungicide will solve the problem. Just follow the directions on the package.
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