Luis Brinas: Is this blackspot or something else ?

last year

Hi everyone,
I was excited to add Pedro Dot's Luis Brinas to my boyfriend's garden this winter (bare root, grafted on laxa). It took off really great and was getting ready to bloom. Then last week we got hit with a big storm with gale force winds. I wasn't too worried because his garden is well sheltered from the winds but there was a ton of rain for days.
Anyway, this weekend I am back there and noticed Luis Brinas' foliage is looking pretty bad. The slight wind damage to the leaf edges isn't what I'm worried about, it's the dark spots on practically every single leaf. None of the other roses near him have the same problem.
I've never had any blackspot on any of my roses here so far, so I 'm not good at recognizing it.
I wanted to try Pedro Dot's roses because they were bred near Barcelona which has a similar climate to here, and I was hoping for heat tolerance. But if heat tolerance comes at the price of disease, it's probably not a rose for me.
Is this black spot or something else?
First pic was Luis Brinas two weeks ago, the next ones show what the foliage looks like now.

Comments (5)

dianela7analabama
last year
last modified: last year
possibly cercospora. If you look carefully you may see the whitish areas showing up. It doesn’t have the typical look of blackspot but definitely diseased. Hope they recover quickly.
seasiderooftop thanked dianela7analabama
Mischievous Magpie (CO 5b)
last year
When I searched your initial image, the internet directed me to images of downy mildew. I have no personal experience with it, though
seasiderooftop thanked Mischievous Magpie (CO 5b)
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User
last year
Although that bears some superficial resemblance to Downy Mildew, I doubt that's it. Downy will cause rapid and near total defoliation by the time it reaches the point where most leaves have marks on them. Also, Downy doesn't cross over the larger veins on the leaf.

I suspect you have Cercospora, or possibly Anthracnose.
seasiderooftop thanked User
seasiderooftop
Original Author
last year
Thank you Dianela, Magpie and Paul for the replies!

I'm surprised because Dianela's pics of spots caused by cercospora and online pics of anthracnose seem much smaller than the ones I'm seeing on Luis. I will check the underside of the leaves later this week when I return there to see if there are any spores to check for downy mildew as Magpie suggested.

I also wonder if this could be some kind of phytotoxicity damage? I had preventively sprayed all the roses there with a horsetail extract and neem oil combo in mid-January. But none of the others have spots, so I wonder if Luis' leaves could be particularly sensitive? Then again if it was phytotoxicity I would think the reaction would have been more immediate, not a month later.

I am reading up on all these diseases. Never had to deal with them before, but the articles I am seeing say to remove the affected leaves. Ugh, in this case that means removing practically every single leaf! It's only been planted a few months ago, I'm afraid if I remove all the foliage so early it will just die. Should I just throw out this rose?
dianela7analabama
last year
last modified: last year
Removing all leaves is perfectly fine, that is what I do. If it is a reaction to the products it shouldnt happen again if you quit using it on it. if it is dsease then it will likely happen some time in the near future again so you will have your answer and can proceed.
seasiderooftop thanked dianela7analabama

Luis Brinas: Is this blackspot or something else ?

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dianela7analabama

Mischievous Magpie (CO 5b)

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Luis Brinas: Is this blackspot or something else ?

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Mischievous Magpie (CO 5b)

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