|
| Help! I have had this knockout rose for a few years and it got too big. I pruned it as I have many roses over the years and now the branches on one side have strange clusters of small red leaves where the blooms would normally be.
Can anyone explain and help me with this? Thank you. |
Follow-Up Postings:
|
| It looks like RRD. Rose Rosette Disease. Eventually it will kill the plant. It looks like the damage is extensive. RRD is said to be a virus spread by a mite. I would wait to see if others agree, and then dig up the plant and as many roots as you can get. Do NOT compost the diseased plant. Kim |
Here is a link that might be useful: My Lady Emma Hamilton was lost to RRD recently
|
| Get rid of it at once. This disease is incurable and contagious to other roses. Best procedure: cut off and bag or burn all the canes with foliage. Immediately paint the cut stubs with full-strength Roundup and wait a week or two (trying to kill the roots). Then dig. If suckers come up from large root sections that you missed, they will be infected with rose rosette. |
|
- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Mon, Jun 25, 12 at 15:27
| The round-up may make your neighboring plants (rose and non roses) look sick also. I recomment that you do not use any herbicide in or even near your flower beds. Even the suggested painting the stubs may not be safe. The Round-Up can leave the roots of the "stub", pass through the soil, and be picked up by the roots of nearby plants. See the link below for Round-up spread: http://www.agron.iastate.edu/news/events/2011staniforth_sm.pdf (page 19 and 20) Also, the glyphosate could remain bound in the soil for long time periods. "Glyphosate [(N-(phosphonomethyl)glycine)] is a widely used herbicide and it is known to compete for the same sorption sites in soil as phosphorus. Persistence and losses of glyphosate were monitored in a field with low phosphorus status and possible correlation between glyphosate and phosphorus leaching losses was studied. Glyphosate and its metabolite AMPA (aminomethyl phosphonic acid) residues in soil samples were analysed after a single application in autumn. Twenty months after the application the residues of glyphosate and AMPA in the topsoil (0�25 cm) corresponded to 19% and 48%, respectively, of the applied amount of glyphosate, and traces of glyphosate and AMPA residues were detected in deeper soil layers (below 35 cm). These results indicate rather long persistence for glyphosate in boreal soils." http://www.springerlink.com/content/w1461w60366lk018/ Then, when you add fertilizer with P; the glyphosate could be released. "The results suggest that re-mobilisation of glyphosate may represent an additional transfer pathway for glyphosate to non-target plants which is strongly influenced by soil characteristics such as P fixation potential, content of plant-available iron, pH, cation exchange capacity, sand content and soil organic matter." http://www.springerlink.com/content/t7h6601566432076/ |
|
| Either way, don't delay acting. |
|
| Henry is wrong. But, Henry doesn't garden in Tennessee so maybe that's what RRD looks like on Knockouts in northeastern Ohio. Maybe not. I've watched RRD on Knockouts in Tennessee and those are some of the symptoms. You really want to put a big bag over that before you dig it out and carry it past other roses at this time of the year. |
Here is a link that might be useful: more about the disease
|
- Posted by TNGardener19 none (My Page) on Tue, Jun 26, 12 at 9:39
| Thank you for identifying RRD for me. I have disposed of the entire plant. I read that some people just cut off the infected canes, but it sounds like that puts other roses at risk of infection, so I didn't want to take a chance. It was not near or downwind of other roses but I'll still keep an eye on the ones that are farther away. |
|
- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Tue, Jun 26, 12 at 10:15
| anntn6b, what part of my warning statement (which I felt that I documented sufficiently) do you feel is incorrect? Henry |
|
| People shouldn't try cutting off infected canes unless symptoms have just appeared within a week or two and they are only out on one cane. Then you can try removing the infected cane at ground level, or better, splitting the crown of the plant. But the virus quickly becomes systemic, so surgery is usually not effective. If the infection is already in more than one cane, then the crown and roots are all infected already. |
|
- Posted by Kippy-the-Hippy 10 Sunset 24 (My Page) on Tue, Jun 26, 12 at 19:04
| Henry, I have not commented on any of your posts, but.... It seems to me you are rather fixated on most every thing in the garden being caused by round-up/aphid/insecticide damage. Rather than wait to see if other roses are showing similar damage, or hunting for round-up users, it probably is a smarter thing to remove one rose plant than wait to see if you are going to loose all of your roses as well as the cause of your neighbors roses rrd as well. Especially if you live in an area where others are loosing roses to rrd. Just saying, sometimes it is smarter to loose one than hunt for round-up jugs in the neighbors trash cans |
|
- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Tue, Jun 26, 12 at 21:04
| Kippy-the-Hippy, your comment has nothing to do with my first post in this thread. I said nothing about waiting. I was commenting on the suggestion that: "Best procedure: cut off and bag or burn all the canes with foliage. Immediately paint the cut stubs with full-strength Roundup and wait a week or two (trying to kill the roots). Then dig. If suckers come up from large root sections that you missed, they will be infected with rose rosette." I (Henry Kuska) disagree with introducting roundup: |
|
| Ugh TNGardender19, I hope you don't live near me lol! I haven't seen RRD in my garden yet, but very few of my neighbors grow roses (even Knockouts), so maybe that's spared me a little bit. I hope you caught yours in time too :) Tammy |
|
- Posted by TNGardener19 none (My Page) on Tue, Jun 26, 12 at 22:20
| TNY78, I would hate "sharing" this with anyone! I'm near Nashville and don't see any other roses in the neighborhood with this problem. However, some of my friends in Brentwood (south of Nashville) said their roses look sort of like my picture so I filled them in on RRD. I never heard of this before, but now I'm looking at every rose bush I see. LOL |
Please Note: Only registered members are able to post messages to this forum. If you are a member, please log in. If you aren't yet a member, join now!
Return to the Roses Forum
Instructions
- You must be a registered member and logged in to post messages on our forums.
- Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review the contents and make changes.
- After posting your message, you may need to refresh the forum page in order to see it.
- It is illegal to post copyrighted material without the owner's consent.
- HTML codes are allowed in the message field only.
- No advertising is allowed in any of the forums.
- If you would like to practice posting or uploading photos, please visit our Test forum.
- If you need assistance, please Contact Us and we will be happy to help.