Ask a Question forum: Knock Out Roses- Newly Planted & Fungus

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Visalia, Ca
PMBixler
Sep 25, 2017 9:40 AM CST
Hello, I'm new here. I recently had about 20 knock out rose bushes planted along my fence line. They are still blooming. I'd like to know how long I should wait for them to establish themselves before I prune them back?

Also, my sunny knock out roses look awful. The leaves are yellow and spotty, and the bush looks dry in some spots. I'm wondering if my landscaper gave me dead fungi invested bushes or is this just winter taking over?
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[Last edited by PMBixler - Sep 25, 2017 9:40 AM (+)]
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Name: Celia
West Valley City, Utah (Zone 7a)
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Zencat
Sep 25, 2017 10:19 AM CST
I don't see much wrong with them. It could be they're just getting acclimated to their new home. How often are they watered like that?
Visalia, Ca
PMBixler
Sep 25, 2017 10:37 AM CST
They look wet in this picture because they had just been planted. We have a drip line that comes on 3 days a week. The yellow knock out roses look like this picture, yellow and unhealthy. Some have the red growth you see in this picture. On some, it appears like it's budding but then the bud is dry and red. I'm new to this so I'm not sure what is healthy, what isn't. I want to make sure I nip any problems early on.

Thumb of 2017-09-25/PMBixler/7c6be6


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Name: Celia
West Valley City, Utah (Zone 7a)
Pour vivre parmi les fleurs
Irises Garden Photography I was one of the first 300 contributors to the plant database! Celebrating Gardening: 2015 Butterflies Birds
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Zencat
Sep 25, 2017 1:36 PM CST
That 1st picture almost looks like sunburn. The second could be something caused by a virus. Aster Yellows, perhaps.

Anyone else have a better idea?
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Sep 25, 2017 1:50 PM CST
That second picture unfortunately looks like it could be rose rosette disease (which is indeed caused by a virus transmitted by a mite):

https://www.google.ca/search?q...:
Name: Suzanne/Sue
Sebastopol, CA (Zone 9a)
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Calif_Sue
Sep 25, 2017 1:51 PM CST

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Transplant stress and/or Black Spot in first picture.

Possible Rose Rosette in second.
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Name: woofie
NE WA (Zone 5a)
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woofie
Sep 25, 2017 1:58 PM CST
Rose Rosette was my first thought, but I didn't want to cause any panic, as I've never seen it myself.
Confidence is that feeling you have right before you do something really stupid.
Visalia, Ca
PMBixler
Sep 25, 2017 2:58 PM CST
At what point should I prune them back after they've been established?
Name: Suzanne/Sue
Sebastopol, CA (Zone 9a)
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Calif_Sue
Sep 25, 2017 3:42 PM CST

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If they have Rose Rosette, they need to be removed.
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Name: Porkpal
Richmond, TX
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porkpal
Sep 25, 2017 4:09 PM CST
Prune the healthy ones in early spring if they need it.
Porkpal
Name: Lyn
Weaverville, California (Zone 8a)
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RoseBlush1
Sep 26, 2017 1:19 AM CST
Calif_Sue said:If they have Rose Rosette, they need to be removed.


Not only do they have to be removed and destroyed. Someone needs to determine where the roses came from. Sue, we don't have any local RRD in California ... yet.

Yes, there were reported cases back in the 1940s, but not recently.
I'd rather weed than dust ... the weeds stay gone longer.

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