Rose Mosaic Virus

A meeting place for rose breeders.
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chuckp
Posts: 260
Joined: Mon Aug 26, 2013 10:40 pm

Rose Mosaic Virus

Post: # 73182Post chuckp
Wed Jul 28, 2021 9:16 pm

Hi Fellow Rose Breeders,

We are burning up here on the Eastern Prairies. we haven't had rain for weeks.
I am noticing a sharp rise in the number of my rose seedlings coming down with RMV,
There is not much published on RMV.
chuckp

rikuhelin1
Posts: 367
Joined: Sat Jul 16, 2016 7:56 pm

Re: Rose Mosaic Virus

Post: # 73187Post rikuhelin1
Thu Jul 29, 2021 7:15 pm

I thought the RMV infection vector was a mite, or already infected rose, cloned from infected bud wood. Good luck on trouble shooting. Interesting observation that yours may be passed on from a parent(s) into the resulting seedling - if it is not post germination infection by the mite.

Perhaps Henry, or Ann is familiar with your observations.
Riku

rikuhelin1
Posts: 367
Joined: Sat Jul 16, 2016 7:56 pm

Re: Rose Mosaic Virus

Post: # 73188Post rikuhelin1
Fri Jul 30, 2021 3:41 pm

Oops got my rose diseases mixed together … the mite is the vector for RRD. You don’t have that one …. TG.
Riku

roseseek
Posts: 5279
Joined: Sun Dec 11, 2011 6:54 pm
Location: Zone 9b Central California, Sunset Zone 15

Re: Rose Mosaic Virus

Post: # 73189Post roseseek
Fri Jul 30, 2021 3:49 pm

As far as I have ever read, RMV is transmitted MOSTLY through asexual reproduction. Perhaps David Zelsak or Malcolm Manners can shed more light? Charles, do you have photos of the suspected symptoms?
Kim
California Central Coast
USDA Zone 9b
Sunset Zone 15
Cooler inland coastal valley with strong marine influence

henry kuska
Posts: 1107
Joined: Thu Dec 15, 2011 9:06 pm

Re: Rose Mosaic Virus

Post: # 73191Post henry kuska
Sat Jul 31, 2021 10:53 am

What temperature zone are you in?

chuckp
Posts: 260
Joined: Mon Aug 26, 2013 10:40 pm

Re: Rose Mosaic Virus

Post: # 73194Post chuckp
Sat Jul 31, 2021 5:15 pm

Hi Kim, I have been digging up all my seedlings showing these steaks.
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roseseek
Posts: 5279
Joined: Sun Dec 11, 2011 6:54 pm
Location: Zone 9b Central California, Sunset Zone 15

Re: Rose Mosaic Virus

Post: # 73195Post roseseek
Sat Jul 31, 2021 5:22 pm

Are you sure you don't have spider mites, thrips or other sucking insects? The spider mites here are LEGION and there are no webs. Check for them under magnification before dumping another seedling.
Kim
California Central Coast
USDA Zone 9b
Sunset Zone 15
Cooler inland coastal valley with strong marine influence

rikuhelin1
Posts: 367
Joined: Sat Jul 16, 2016 7:56 pm

Re: Rose Mosaic Virus

Post: # 73197Post rikuhelin1
Sat Jul 31, 2021 6:17 pm

Maybe a blind lead l offer, but to my eyes have milder version of pattern on various rose types in my gardens. Two hot provinces to west of you. I tend to drench with overhead water irrigation whirlies in morning for half hour.

Under leaf, no visible mite but some minor leaf perforation and associated discoloring … in main zone. Photos via magnifying glass.

Winnipeg Parks leaf … the rose that got me going.

Because commercially available and not noticeable in pan view of garden , l am not sweating it. Your story different however. If they were my seedlings l would not be dumping - there hard enough to get. Try a hospital quarantine bed till diagnosis for culled ones.
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Riku

henry kuska
Posts: 1107
Joined: Thu Dec 15, 2011 9:06 pm

Re: Rose Mosaic Virus

Post: # 73198Post henry kuska
Sun Aug 01, 2021 11:53 am

Do all of the seedlings that exhibited the yellow blotches have a common parent?

david zlesak
Posts: 475
Joined: Tue Nov 26, 2013 12:27 pm

Re: Rose Mosaic Virus

Post: # 73200Post david zlesak
Mon Aug 02, 2021 1:09 pm

I struggle sometimes too with seedlings that look a bit odd and like they may have a virus. Here is a photo of a seedling that grew really awkwardly and then eventually grew out of the strange yellowing and lack of expansion of impacted leaves. This plant was growing under lights in the basement and its siblings looked normal right next to it. A colleague was willing to check symptomatic leaves for viruses using high throughput sequencing, but nothing came up. There are other seedlings that show these symptoms too. There are a limited number of polyanthas that tend to have similar symptoms and have somewhat of a shared background.

Darn, the photo isn't attaching properly. I'll have to try again later.

david zlesak
Posts: 475
Joined: Tue Nov 26, 2013 12:27 pm

Re: Rose Mosaic Virus

Post: # 73201Post david zlesak
Wed Aug 04, 2021 12:42 am

Here's a photo of the seedling tested with HTS and nothing viral was identified.
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roseseek
Posts: 5279
Joined: Sun Dec 11, 2011 6:54 pm
Location: Zone 9b Central California, Sunset Zone 15

Re: Rose Mosaic Virus

Post: # 73202Post roseseek
Wed Aug 04, 2021 12:49 am

It's remarkable what sucking insects can produce, isn't it?
Kim
California Central Coast
USDA Zone 9b
Sunset Zone 15
Cooler inland coastal valley with strong marine influence

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