Observation 137024: Undetermined

When: 2013-06-20

Collection location: Braga, Portugal [Click for map]

Who: Elsa (pinknailsgirl)

No specimen available

On my roses.

Species Lists


From other rose, next to the previous.
From other rose, next to the previous.
From other rose, next to the previous.
From other rose, next to the previous.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I’m just kidding
By: Elsa (pinknailsgirl)
2013-06-26 12:21:57 CDT (-0400)

but you are the one that expressed the doubt of being non-fungal. I’m sure that it is the same, what I see is the same pattern on first leaves and on the last ones (branches pattern in red/brown/black). I cannot understand your (yours and Gerhard) doubts till now. But if you don’t have experience on this, maybe you shouldn’t doubt of my name proposal, just maybeeee. By other side, the probability that the second leaves show a different organism than the others is much lower than the probability that your spots and mine being the same :p This is a very easy to spread fungi, it goes with the wind… so if you don’t have a rose resistant to it, it will get infected, as well, and easily.

The only instruments that I have to mey proposal is to compare with google photos and the fact that the fungicide results. If you think the observation deserves a non-fungal title, maybe there are hundreds of obs. that need to change the name.

By: Byrain
2013-06-26 11:47:06 CDT (-0400)

Do you need to convince me? I’m not even close to an expert. :)

In my very non-expert opinion, you might have photographed two different kinds of rose leaf spots. Gerhardt knows european fungi better than me, maybe he has some better ideas?

By: Elsa (pinknailsgirl)
2013-06-26 08:20:44 CDT (-0400)

See if these pictures convince you because I’m tired of taking photographs, LOL.

By: Byrain
2013-06-20 20:32:07 CDT (-0400)

No, I am not sure these black spots are not fungal nor does it seem like I am sure with a ‘could be’ vote. I saw your reference photos, I think a lot of people call their black spots on roses D. rosae without much second thought, but the spots I have scoped has no visible hyphae or spores so I’m afraid I wouldn’t know what to do with your specimens to help id it.

By: Gerhard Koller (Gerhard)
2013-06-20 19:45:42 CDT (-0400)

I know of Peronospora but I think yours is other origin.

Thanks Gerhard
By: Elsa (pinknailsgirl)
2013-06-20 19:30:55 CDT (-0400)
There’s also a
By: Gerhard Koller (Gerhard)
2013-06-20 18:19:10 CDT (-0400)

Septoria rosae, seemingly the anamorphic stage of Sphaerulina rehmiana

Here’s a link
By: Gerhard Koller (Gerhard)
2013-06-20 18:16:37 CDT (-0400)

to common plant diseases of fungal origin:


Besides Diplocarpon rosae there are a few other diseases but I would have to look thoroughly.

Your photo could show the Marssonina stage of Diplocarpon, the anamorph.

After all Byrain
By: Elsa (pinknailsgirl)
2013-06-20 18:00:31 CDT (-0400)

you seem to be sure you don’t have any fungi on your roses. I added a photo in ref. to me is similar to this one. In mine, a see some structures on micro that could be spores. So, I don´t know what to say… I can send you a leaf if you want. I looked for another disease on roses that could make this spots, but I didn’t find any, neither other fungi referred to roses. Did you see google photos?
What are the differences that you see between this photos and D. rosae ones?

From my experience,
By: Elsa (pinknailsgirl)
2013-06-20 13:30:14 CDT (-0400)

and I had this thing many times on two roses, if you do nothing, the leaves get spotted, yellow and fall, and “this thing” spreads to all the leaves. Initially I only used to cut the spotted leaves, and get rid of them. But soon I keep noticing that new ones began to show spots too. So I bought this antifungal spray and it results.
So, after spraying, the damaged leaves can’t recover, obviously, but the new ones grow healthy.

I saw no mite or insect on them.

By: Byrain
2013-06-20 13:17:00 CDT (-0400)

the anti-fungal spray make the spots disappear or do the newly formed leaves just not have them? And I’m not an expert on D. rosae or rose leaf spots, I just know your observation looks exactly what is on my roses which I am not sure is fungal. I could never find any of the little black fruit bodies either, maybe they don’t always appear though?

Well, Byrain
By: Elsa (pinknailsgirl)
2013-06-20 13:11:13 CDT (-0400)

these are the only leaves that left, I took a picture to upload here. But I sprayed with antifungal and it resulted, the new ones don’t have any spots. I’m going to take pictures of the other leaves (already dried) they show that radiating pattern, I think.

Well, Byrain
By: Elsa (pinknailsgirl)
2013-06-20 13:10:42 CDT (-0400)

this are the only leaves that left, I took a picture to upload here. But I sprayed with antifungal and it resulted, the new ones don’t have any spots. I’m going to take pictures of the other leaves (already dried) they show that radiating pattern, I think.

I scoped something like this.
By: Byrain
2013-06-20 12:51:10 CDT (-0400)

And couldn’t find anything fungal, D. rosae is supposed to have a radiating pattern like this . I’m not sure what is on your roses or mine shows this.

Created: 2013-06-20 12:27:07 CDT (-0400)
Last modified: 2013-06-26 15:08:31 CDT (-0400)
Viewed: 174 times, last viewed: 2017-06-16 04:13:34 CDT (-0400)
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