Roses forum: Rose issue help needed!

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Jun 3, 2019 5:57 AM CST
Does anyone know whether there is an issue with this rose? The discoloured patches are white so unlikely to be rust. Some brown bits on the edges. Should I be worried?

Thumb of 2019-06-03/Ksekale/3353fe

Zone 9, Sunset Zone 9 (Zone 9b)
Jun 3, 2019 6:35 AM CST
This reminds me a bit of rose mosaic virus to my eye in training. Anyone else care to join in? Please let me know if I am wrong. Some roses have this and some don't. Usually it is bred out of the rose. Is yours a newly purchased rose or an older rose in your garden? If it is rose mosaic virus, there is nothing you can do about it. Just enjoy the rose if its performance is good for you or you can replace it. It would not spread to the other roses in your garden.
Name: Mike Stewart
Lower Hudson Valley, NY (Zone 6b)
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Jun 3, 2019 9:16 AM CST
Sometimes rose mosaic virus (RMV) can present the way these leaves appear, but more often it consists of bolder, nearly symmetrical, zigzag lines across the leaf, rather than the spotty pattern that looks like a "pointillism" painting as shown here. If it is RMV, there's nothing you can do, and nothing really to worry about. It doesn't naturally spread to other roses via insects (like Rose Rosette disease).

Instead of RMV, my suspicion is that you have small sap sucking insects on the underneath side of the leaves, chewing on the tender portion of the leaf tissue. This can lead to a skeletonized appearance. Culprits could be rose leafhoppers and rose slugs. The former look like tiny greenish white insects with wings but that tend to hop more than fly when disturbed. They often feed on the underneath side of leaves, but tend to make larger holes than shown in your image. Rose slugs look like tiny green inch worms that sometimes curl up into little circles at their youngest stage. Their color matches the underneath side of the leaf so well that you can easily miss them. Or, it could be another type of insect. If rose slugs are your culprit, you have quite an infestation of them, so you should be able to see them by turning the leaves over. If this is the case, there are various treatments, either organic (like spraying the undersides with horticultural soap solution in a spray bottle), or poisonous insecticides, of which there are many. Be sure to confirm the actual presence of rose slugs before spraying.
[Last edited by Mike - Jun 3, 2019 6:50 PM (+)]
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Coastal Southern California (Zone 13a)
Jun 3, 2019 10:29 AM CST
I'm with Mike. I don't think this is RMV at all, but rather:
". . . small sap sucking insects on the underneath side of the leaves, chewing on the tender portion of the leaf tissue. . . . "

I don't have a clue where you are located, or what your conditions are. I might actually consider use of something like Neem Oil (concentrating on the UNDERSIDE of the leaf) unless you are having a lot of hot weather -- in which case I'd go for water sprayed from underneath -- or a mild insectidal soap.
(Zone 5a)
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Jun 3, 2019 10:54 AM CST
I think l see very young rose slugs.
Squish, squish, squish!
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Name: Carol
Alberta, Canada (Zone 3b)
Jun 3, 2019 10:57 AM CST
My first thought was rose mosaic virus. Definitely check for bugs though...
Name: seil
St Clair Shores, MI (Zone 6a)
Jun 3, 2019 1:15 PM CST
That looks like rose slug damage to me. They crawl around eating the backside of the leave and leave those marks.
Long Island, New York, USA (Zone 7a)
Region: New York Roses
Jun 3, 2019 1:28 PM CST
I was thinking rose slug too. There must be a lot of them to make all that damage and so widespread. Happy squishing! Hilarious!

Jun 7, 2019 12:26 AM CST
Hi thanks everyone,

I can't see any rose slugs on them back or front! But will get up closer and see if they are very young and small.

Will look into RMV too.

Thanks do much everyone for your help!

Long Island, New York, USA (Zone 7a)
Region: New York Roses
Jun 7, 2019 7:39 AM CST
Kate, take a good look they can be hard to spot since they are small and green and can blend in easily.

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