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Discussion id : 91-972
most recent 7 APR 16 HIDE POSTS
 
Initial post 7 APR 16 by CHERYL'S GARDEN
I have a ketchup and mustard rose that I bought from a nursery last year and it never grows because of black spots on leaves and stems. I have sprayed it for black spots but nothing seems to help. So I have cut all the black spots of the plant to there is hardly a rose bush. Shall I get rid of it and buy another one? Is this contagious to other roses bushes?
REPLY
Reply #1 of 1 posted 7 APR 16 by styrax
Yes. Some roses will simply not grow in some climates. It is contagious, but ever enough for it to be an issue for me.
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Discussion id : 84-417
most recent 20 APR 15 HIDE POSTS
 
Initial post 20 APR 15 by Silvestris
This is the first time I post a question, so please let me know if I'm doing it wrong.

I have a big black spot problem in my rose borders - the vast majority of my plants are suffering from it, only a few have managed to stay healthy. I've tried removing all leaves, pruning the bushes so they're more airy and treating the soil with Trichoderma-enriched mulch, but I really can't say I've seen any improvement.

This last winter has been so mild I'm already finding the first black spots on my plants. I'm loath to simply get rid of the bushes, since many were hard to get and couldn't be replaced. So is there any other, more efficient way of treating it? All help and suggestions are very welcome!

Thank you.
REPLY
Reply #1 of 3 posted 20 APR 15 by Jay-Jay
Maybe this will benefit Your roses...
Spraying solution used by the Rosarium in Winschoten Netherlands:
List of ingredients per litre hand-warm water(lowest used amounts)
- 2 grams of Magnesia-sulphate (Bitter-salt)
- 2 grams of spraying sulphur (f.i. Microsulfo Bayer or in the US: Micro Sulf® see:
http://www.nufarm.com/USAg/MicroSulfr )
- 2 ml of Algeco S (or another sea-algae solution)
- 7 ml of a seaweed extract
- 5 grams of sodium-bicarbonate (baking-soda)
- 5 ml of sunflower seed oil,
- 0.25 ml of dish-washing detergent,

Dissolve in 1L lukewarm water and use under dry weather-circumstances at temperatures below 25°C.
Clean the spraying equipment after use with hot water and detergent or degreaser.
Repeat after lots of raining or in 10-14 days' intervals)
Success and good luck!
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Reply #2 of 3 posted 20 APR 15 by Silvestris
Thank you very much! I'll see fi I can get my hand on all of the ingredients and give it a try!
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Reply #3 of 3 posted 20 APR 15 by Jay-Jay
Try the drug-store or the Pharmacist.
You might do it the simple way if not all the ingredients are available: Just use the Micro-sulphur from Bayer.
Most likely to get in Sweden too at the hardware-store or an agricultural shop.
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Discussion id : 81-153
most recent 18 OCT 14 HIDE POSTS
 
Initial post 18 OCT 14 by Carlene Gerette
This is an excellent rose that survived harsh conditions with little care and blooms a lot.
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Discussion id : 79-564
most recent 25 JUL 14 SHOW ALL
 
Initial post 21 JUL 14 by arahn92
PLEASE HELP!, i live in north west florida, i am a first time rose grower, i have two potted roses (garden party, and a mister lincoln) at first they did perfect and were gorgeous with huge blooms, but they are not completely ravaged by black spot, i have been spraying with neem oil to try and help. i also do not water overhead, they get good sun, i pick up leaves that drop in the pot etc but they got infected anyway and now they are almost completely defoliaged and i cannot seem to do anything to help them.. :/ i also think recently rose canker has taken hold as well as some of the canes are turning brown and dry and look dead. :( i think i did make the amateur mistake of forgetting to clean my clippers after every use and I'm sure that didn't help.. but I'm thinking there going to die, or maybe i should just try and start over, but my hearts broke and i feel like it will just happen again because the climate here is wet and hot and humid in summer :( PLEASE HELP!
REPLY
Reply #1 of 3 posted 21 JUL 14 by Jay-Jay
maybe try spraying sulphur and or a bigger pot.
There no room for them in the garden(soil)? Lots of roses that get badly infected by blackspot when potted, do well planted and established in the garden.
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Reply #2 of 3 posted 21 JUL 14 by arahn92
hmm, okay.. i didn't plant them in the garden where I'm at because i was afraid of them getting out of hand and I'm only renting here so i didn't know if the owners would appreciate me planting them like that, but I'm moving to my own home soon so maybe i will just plant them there in the ground, but honestly they seem like there not gonna make it, maybe if i transplant them they will.. idk
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Reply #3 of 3 posted 25 JUL 14 by Wendy C
this is what I would do, were they my roses.

1. Strip off all of the affected foliage
2. Set them in full sun where they can get maximum ventilation.
3. Make a 5% bleach solution and spray the roses head to toe and the dirt in the pot.
4. The next day lightly powder them with baking soda.

I know this sounds extreme, however I've had very good results using this method. Keep them in full sun and the foliage as dry as possible.

Good Luck
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