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Discussion id : 96-174
most recent 23 DEC 16 SHOW ALL
Initial post 4 DEC 16 by Andrew from Dolton
Does anyone know a a way I can try and reduce the amount of black spot in my garden? I live in the bottom of a valley where there are low night temperatures in summer and heavy dews. In the U.K. we don't have a Continental climate with long summers and winters with short springs and autumns. Spring can start in February but still go on until the end of May, likewise, autumn can start in August but we still can get warm weather in November. There is usually high rain fall throughout the year and frosts in June and August are not uncommon. Certain roses grow very well, Gallicas, Damasks, Albas and certain species crosses like x 'Highdownensis' grow very well. Others, like 'Compassion', 'Iceburg' and most David Austin roses struggle to thrive and after the first year gradually become poorer. Almost every rose I grow gets black spot to some degree although I have never experienced any type of mildew or rust. Even the wild populations of Rosa arvensis are almost defoliated with this disease. I also believe there are issues with trace elements in the soil. It is a slightly acid well drained loam. The heavy rain fall we experience has I believe deluded the soil of certain elements like boron. I am experimenting with dressing the soil with borax and lime this winter. Every spring I give the roses a dressing of fish, blood and bone, I also mulch with my home made compost and chicken manure pellets added. I am fastidious with collecting up the diseased leaves which I burn. For next season I want to plan a structured spay programme which ideally should be as organic as possible but this is not set in stone. Any suggestions other members have would be greatly be appreciated, thank you.
Reply #1 of 2 posted 5 DEC 16 by Jay-Jay
sent You a PM.
Reply #2 of 2 posted 23 DEC 16 by StrawChicago Alkaline clay 5a
Andrew: Google "Organic rose" and you'll see Organic Rose Growing - Gardenweb, where I posted info. on trace-elements to fight blackspots and to neutralize acidic rain. Red-lava-rock is high in potassium and boron, pea-gravel rocks is high in magnesium & calcium. Wood-ash is high in trace-elements, pH over 12.
I gardened in both acidic clay and alkaline clay. Last house of acidic clay & roses grafted on Dr.Huey: it was a BS-fest. Present house of alkaline clay: Dr.Huey likes it alkaline, so much less. 99% of my roses are own-roots .. the own-roots like it acidic when they are tiny-babies, but as they get older, depending on their genetics, their roots get woody like Romantica roses, and certain Austins (I listed all the info. which own-roots like acidic and which ones like alkaline in Organic rose).

For less blackspots, I focus on making the soil below loamy & fluffy for best potassium up-take, then I use a buffer on top to neutralize acidic rain. The buffer could be dolomitic lime (calcium & magnesium), red-lava (potassium & boron), colorful-pea-gravel (variety of alkaline minerals), wood-ash (high in boron and zinc), and black-peat-humus (nitrogen & magnesium & calcium).

Since HMF doesn't allow me to post more than one links, I'll put the links in my main HMF-profile as to which OWN-ROOT like it acidic, and which OWN-ROOT like it alkaline, plus what's the best soil & pH-level for different types of rootstock.
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 #1 of 1 posted 7 APR 16 by Salix
Yes. Some roses will simply not grow in some climates. It is contagious, but ever enough for it to be an issue for me.
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 #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: )
- 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!
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!
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.
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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