My roses have cancer!!!


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Would anyone know what could be causing this and what I should do about it? First image is Don Juan climbing rose and second image is Double Knock-out. Just started showing this over the last week or so. I am pretty sure it isn't cancer but I thought I'd try to liven this place up a bit!
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As far as I am aware. Rose Cancer has nothing to do with roses. Actually it refers to breast cancer.
With respects. You title your thread. My Roses have cancer. Then in the text, you admit you don't consider it to be cancer. Then you thought you'd liven this site up. Most confusing. Especially for a PEASANT.

Your roses, as with most other plants has simply decided to drop some of their leaves. Simply pick them off and burn.

Does this place need livening up???????
 
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Smile a little, Mike - the peasant comment was not intended to offend you (or anyone) - it was sarcasm to illustrate a point. I'll try to be a little more stoic going forward, but I cannot guarantee it...

Thank you for your help.

I once created a post here titled I Hate Texas (there were evil extra-terrestrial creatures living inside some hot peppers - I am a total novice gardener but, I like to have fun) - to my fantastic surprise, someone was actually offended by it. I grew up in NYC - when someone says they hate NY, I just laugh. ;)

Yes, people need to lighten up, in my humble yet perfect, never incorrect, opinion.
 
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People already respect me and clear a path when I walk.

Are you in disagreement with Mr. Allen's diagnosis?

I've been contemplating a fungicide that works on everything as a preventative, as opposed to waiting for a problem and then reacting, but I haven't settled on a product yet. I have a copper based product being delivered today on the chance that my roses have fungi...
 
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The problem with medicines is they are so specific. We have suffered sudden oak death and shot hole borers which cultivate fusarium by feeding it tree sap. My roses get black spot. I use Clearys 3336 F (flowable) for the black spot. I used it on a cypress that was showing fungal stress. It took a couple years of spraying, and heavy concentration for the tree. It seems ok now. The black spot clears up in the new growth on the roses. It lasted a long time, as in a year. I need to spray them again.
 
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Using my best cryptographic skills - you disagree with Mr. Allen and you believe my roses may have black spot?
It does not look like black spot to me. But I am not very good at roses so to say it was just dropping old leaves or it was a watering thing is risky.

Crappy wet weather has fungi popping up everywhere over here. I kinda took a double take when I found out UK banned the copper for fear of soil toxicity buildup. But its in a pot. You can kill it with betadine too. 30-45mL to a gallon of water. It does not hang around though, and washes away with rain.

Here is the 3336 label
 
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My roses get the same thing, I think that the leaves are getting old and will fall off but I would take them off. I don't use anything on mine, mine get black spot but they recover from it, just clear the leaves when they fall off.
 
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May I make a professional point. There is no cure for Rose Black Spot. Removal of affected foliage is the ultimate. Actually the leaves act as a protection, so if and when leaves show signs of trouble. Remove them. The use of fungicides will not cure ailing foliage. However such use can help to protect against infection
 

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Going back to the early 80s I used to spray my roses for black spot with a systematic spray every two weeks, it would stop it but as @Mike Allen has said it doesn't cure it but it covered the leaves with a white powder, when I stopped it would come back so now i just leave it and take the fallen leaves up and mulch them in the spring after feeding them.
 
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Going back to the early 80s I used to spray my roses for black spot with a systematic spray every two weeks, it would stop it but as @Mike Allen has said it doesn't cure it but it covered the leaves with a white powder, when I stopped it would come back so now i just leave it and take the fallen leaves up and mulch them in the spring after feeding them.
The clearys 3336 gives me a long run on the red cascade roses. It comes back but it takes a really long time. I have found a systemic that can be used around edibles (haha I found) that impacts a lot of spots but mainly is used on phytophthora(?) root rot and some fusariums. Its an ag product that is some form of potassium salts of phosporous acid. Sounds pleasant.
 
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Looking at this from another angle....your roses are in pots Zen Master. How often do you feed them? If they are watered regularly then any nutrients in the soil will be washed out. Roses are thirsty, hungry plants and must be fed regularly (especially in pots) to keep them in condition.
 

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