Roses forum: Rose disease question

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Wescx005
Mar 20, 2019 10:41 AM CST
Hello I live in the Dallas Texas area, bought a house last fall and out front is a large pink rose plant. It looked healthy but as I observed it into fall all of the older leaves seems to developed spots / and or turn yellow or brown. New growth was good so I figure it had a bug or disease / larve. So right before winter I cut it way back, over half the growth removed. Along with the bad looking shoots. Now spring is here and again I'm seeing same thing. Please help I've looked around web to identify but there are so many I don't have a strong knowledge in roses but I'd like to keep the plant if I could. Pictures below !
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Name: Zuzu
Northern California (Zone 9a)
Charter ATP Member Region: California Cat Lover Roses Clematis Irises
Garden Ideas: Level 2 Celebrating Gardening: 2015 Plant Identifier Garden Sages Forum moderator Million Pollinator Garden Challenge
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zuzu
Mar 20, 2019 12:00 PM CST

Moderator

It looks like rose mosaic virus. It's a rose disease many roses have. It isn't contagious to other plants and it usually doesn't have an adverse effect on the rose. Some of my roses with the virus are more than 30 years old and are perfectly fine except for the discoloration of the foliage in spring. As the weather warms up, those leaves will be replaced by healthy green ones.
Coastal Southern California (Zone 13a)
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jerijen
Mar 20, 2019 1:41 PM CST
I've looked and looked, and I don't see RMV. (It's probably there, but I don't see it.) The round black spot is Blackspot -- a fungal disease which is worse in warm, damp conditions.

You can learn more about it at:
https://en.wikipedia.org/wiki/...

The dark red leaves are just new growth. Don't worry about that. The leaves will turn green.

The yellow leaves -- maybe older foliage which is ready to fall, OR there could be issues with a need for nutrients.

GOSH -- you guys sure cut roses back farther than we do, out here (where there is no freezing weather)!!!
Name: seil
St Clair Shores, MI (Zone 6a)
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seilMI
Mar 21, 2019 9:01 PM CST
I agree with Jeri's assessment. They really don't look all that bad to me. You can take off the yellowing leaves and if you use chemicals find a good fungal spray for the blackspot. Otherwise they look fine.

Jeri, if you think Dallas cuts back a lot you should see what Detroit has to cut back to, lol!
Zone 9, Sunset Zone 9 (Zone 9b)
Roses
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Mustbnuts
Mar 22, 2019 11:18 AM CST
Are you in the area of Texas that gets a lot of moisture? Looks like black spot to me. It is easily treatable or pull off the leaves (that is what I do, especially in early spring if the leaves are old). New ones will grow back and hopefully it will be warmer and more sun so that it doesn't come back. Make sure you dispose of the leaves rather than leaving them on the ground. You want to get rid of those fungal spores and make sure they don't come back.

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