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| For what it's worth, I got this in a newsletter from Howard Garrett, AKA "The Dirt Doctor", who is an organics supporter who has a website, radio program (Dallas, TX), and a line of organic gardening supplies. If you have it, it's worth a try. I particularly like the first sentence in his article. |
Here is a link that might be useful: The Dirt Doctor's Rose Rosette Organic Treatment
Follow-Up Postings:
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| While I agree with some of the advice (stop growing Knockouts, LOL) removing infected canes isn't really a cure. It's like amputating your leg to get rid of gangrene. It can save the bush, but it doesn't kill the virus. |
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- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Mon, May 20, 13 at 20:44
| Hydrogen peroxide has been shown to help with a different plant virus infecting a different plant. Whether it helps with rose rosette virus will require controlled scientific studies. Still, since it is such a simple procedure, home rose growers who catch the infection early, may want to try it (first cutting off the infected cane at the crown) and then applying 3 % hydrogen peroxide to the remaining plant, "In spite of the enormous information from research on genetics of plant disease resistance, the question still remains unresolved: what is directly inhibiting or killing pathogens and suppressing symptoms in resistant plants? This is particularly true for resistance to viral infections. Here we show that externally applied reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) or ROS-producing (O 2·− [superoxide] and H2O2) chemical systems infiltrated into tobacco leaves 2 hours after inoculation suppress replication of Tobacco mosaicvirus (TMV) in the susceptible Samsun (nn) cultivar. This was determined by a biological and a real-time PCR method. Infiltration of leaves of the resistant Xanthi (NN) cultivar with the ROS-producing chemicals and H2O2 significantly suppressed local necrotic lesions (i.e. the hypersensitive response) after inoculation of tobacco leaves with TMV. Accordingly, an early accumulation or external application of ROS, such as O 2·− and H2O2, in tobacco may contribute to the development of resistance to TMV infection." http://www.akademiai.com/content/q055880253up3p57/ At least, the hydrogen peroxide may kill the mites. |
Here is a link that might be useful: link for above the hypersensitive response
This post was edited by henry_kuska on Mon, May 20, 13 at 23:25
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| I don't have knock-outs and I garden completely organically. I still lost over 50 roses to RRD. |
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| oh dear - I have to say I don't like the first sentence - Knockouts do NOT constitute a monoculture, merely an aesthetic decision. Any mass planting of one species, with no other integral plantings could as easily be called a monoculture, including a rose garden without a single Knockout. Off topic regarding RRD but I am, in fact, getting a bit sick of Knockout snobbery (which is jumped upon vigorously when applied to Austins). I cannot see the problem - why denigrate healthy choices, made by thousands of people. From what I have gathered, Knockout is no more susceptible than any other rose to RRD. FWIW, impatiens, which is also a snob's bete noire, has been utterly decimated by downy mildew.....yet nowhere is there a nasty backlash against all those ubiquitous planters of bizzie-lizzies (the UK term). |
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| Aesthetically, KOs perform quite well. So, I'd argue that KOs are not an aesthetic decision but either a time-managemet decision or an intellectual or even class decision. KOs are like Agatha Christie mysteries or the Volkswagon (people's car) of roses and do a good job of it. Not everyone reads Turgenev or drives a Mercedes. I was in a lovely little garden last night. For roses, the fellow had a couple of leggy climbers on an arbor, what might have been a Charlotte Armstrong, and a KO. The KO was huge, healthy, in full flower--the biggest eye candy in the garden. |
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| Camp, I have to agree with Garrett on the subject of Knock Out roses. When that's the only landscape plant used, that's a monoculture. I used to see more roses planted in commercial landscaping, and other plants, too. But most died during our drought a couple of years ago, and virtually everything has been replaced with KO. I passed a long median on a busy street yesterday. It used to have a variety of landscaping, including many blooming plants, now the entire length is KO. It's about 1/2 mile long. Pity. The main cheap, overused landscaping plant used to be ligustrum. Now, it's KO. I guess I'd rather look at it than ligustrum, though, even though it's become a cliche. |
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| Yeah, well KO seems to be the Bonica or Sommerwind of the age. Because they are not that ubiquitous over here, I do rather like the semi-double cherry red form and would not be averse to growing a couple. Wasn't Portland famous for growing a single type of rose.....everywhere? I dunno - I guess if I was confronted by a disease which threatened a whole swathe of my plants, I would be looking at rescues and probably pointing fingers too - it just seems a bit mean to actually blame the planting of a particular plant (Knockouts) and not really stating the whole story. There is a lot of snobbery in gardening (and I am certainly not immune) but ultimately, I am usually glad that people are planting anything, rather than paving over yards and gardens. What is 'Garrett juice'? |
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| Catsrose, I read the article, and also read the post by the woman with the infected roses, and couldn't find any statement that said that growing organically will *prevent* RRD. In fact, the woman with the infected rose has also been growing organically for years, and thinks it came from a neighbor's plant. The neighbor doesn't grow organically. I think Henry is onto something here, with the peroxide. And organically grown plants are known to be stronger. Here's the woman's story. I'm not insisting that it works; I've never even seen RRD, so have not used it. I'm putting this here so people will know about this option. I'd like to see a recent post by her, stating that her rose is still free of RRD after it's had time to grow more new canes. |
Here is a link that might be useful: RRD treatment
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| The homeowner may have gotten lucky and cut the cane out before the virus got into the roots. Going to her pictures, it was a huge Cl Old Blush Serious question: has anyone else seen the black coloration on canes in an almost cheetah pattern that she photographed? I've seen Cl Old Blush with solid black dead canes that were witches brooms, but that speckled pattern is new to me. Organic vs Not: organics may have more spider mites which are predators of the vector mites. |
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| I found a YouTube video for Garrett Juice |
Here is a link that might be useful: Garrett Juice Recipe YouTube Video
This post was edited by andreajp on Tue, May 21, 13 at 11:59
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| It is wrong and dangerous for Garrett to claim this as a cure--dangerous because it encourages people to keep badly infected and infectious plants around. He just made the "cure" up and apparently hasn't even tested it anecdotally. Also his instructions are misleading because they suggest that people need prune off only those stems that have weird growth, rather than the whole underlying cane, or more. The lady who accomplished a "cure" has a misleading "after" picture. It shows a stem that obviously started into growth four or five weeks ago, well before she applied the treatment (which was "2 or 3 weeks ago"). In that time, you might get a bud to break and grow an inch or two. Rosette symptoms generally affect brand new basals or new secondary shoots starting off of infected canes. People should handle hydrogen peroxide with care. I don't know whether or not it is safe to inhale aerosol of 3% solution or to get it in your eyes. Not knocking on eahamel here, but Garrett is not to be trusted. |
Here is a link that might be useful: toxicity of hydrogen peroxide
This post was edited by michaelg on Tue, May 21, 13 at 12:23
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| Thanks, Michael, you have some good points. I, too, think there needs to be more than one instance of a person treating one plant for RRD to conclude that he has a cure. That bothered me. But I would like to find out if it would work, and the only way is for someone to try it and report what happens. |
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- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Tue, May 21, 13 at 13:08
| michaelg's link is to toxicity of hydrogen peroxide at high concentrations. The following is the label for 3 % hydrogen peroxide: http://dailymed.nlm.nih.gov/dailymed/archives/fdaDrugInfo.cfm?archiveid=37040 The MSDS is at: For an individual sick rose (after cutting down the diseased cane), I assume that a paint brush application could be used to enhance the immune response. |
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| Thanks, Henry. Looks like Garrett's formula (pint @ 3% per gallon water) would be safe to spray. |
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| Howard Garrett's advice always includes his sick-tree treatment, Garrett juice, orange oil, cornmeal, dry molasses, and greensand. Any column he writes or radio show he broadcasts, recommends these things. Same old, same old. Some of the things he advocates are common sense and some don't make a lick of sense - at least to me. He's right when he says 'feed the soil', but his manner suggests that only organic advocates care about the soil. He and the late Dallas rosarian Field Roebuck had some spirited disagreements. I don't care for his dogmatism. So just take from his suggestions what seems good to you and leave the rest. I hope someone does find help for rose rosette disease. Maybe if we try different things, we'll happen on to a good thing. But I would caution against taking everything he says as gospel. Lou |
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- Posted by dirtdoctor1 8 (My Page) on Sun, Nov 24, 13 at 18:32
| We need to talk about vinegar because theres been some bad advice on this this great site. First of all - my rose rosette cure works very well. The details are on my web site - dirtdoctor.com. If any of you have any questions, let me know at info@dirtdoctor.com or call me on the air tomorrow morning on my radio show at 866-4444-3478. Love to talk to you. Also - any of these gardeners that say vinegar is just acidic acid are wrong! Vinegar has major nutrients, lots of trace minerals, enzymes, carbon and other good stuff. All you have to do to see how well it works - is try it! |
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| Distilled white vinegar IS just acetic acid and water. Distilled white vinegar is made from ethanol. Look it up. There are different types of vinegar with different contents. They are not all the same. |
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| Another question -- The "After" photos and information were made in 2012. We're now draggin' our rears right up on the end of 2013, so it's been at least a year. What's going on with that rose NOW? A year later, is the Cl. Old Blush growing clean? Or does it have Rose Rosette??? IMWTK! Ann, I've seen something very like those blotches on roses here in my often-dank Southern CA coastal area, which have been hit hard by downy mildew. Spider Mites: Out here in CA, you have more spider mites by far in plantings regularly sprayed with insecticides. Not just in gardens, but in the miles of vegetable fields here on the Oxnard Plain. To get rid of the mites, local farmers quit spraying, and cultivated "insectaries" around their fields. Success! Jeri |
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| Just for the record, I'd like to note that the sources linked to above (and other places also) often seem to "hint" that somehow the prevalence of Knock Out plantings is somehow associated with or maybe even directly responsible for spreading around RRD; and the one above rather illogically hints that the disease was not her fault because she gardens organically, but since her neighbor does not garden organically, the disease probably came from her neighbor's non-organic garden. Both of those ideas/associations are WRONG--but people keep on suggesting there is some causal link between KOs/non-organic gardening and RRD. WRONG, WRONG, WRONG. From my own experience I can testify that there have been four cases of RRD in my gardens (over a 3-4 year period) and that NONE of them involved my two Knock Outs. The four cases of RRD involved: 1 well-established hybrid musk; 1 very well established rambler (Golden Showers); 1 newly planted floribunda (Easter); and 1 Austin (St. Swithun). Two of the cases were in spots fairly close together but not next to each other; the other two cases were both in completely different parts of the garden. I know this has been stated before, but people still seem to think there must be some kind of connection between RRD and a common rose they don't like and/or a type of gardening (inorganic) that they don't like. They are confusing their own prejudices with causation. WRONG, WRONG, WRONG. Sorry, but I get irritated when posters keep on passing around false rumors. I'll be quiet now--OK? Kate |
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| Confusing personal prejudices, preferences and perceptions with causation and facts is not limited to roses. Tho I have wondered if my cats know something about vacuum cleaners that I don't know. |
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| I agree with your cats. |
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| I think the reason why Knock Outs are blamed for spreading RRD is the same reason Multiflora is blamed: there is a lot of both of them out there. Nobody keeps an eye on the wild multiflora or gets rid of a plant promptly if it gets RRD so mites have plenty of time to eat and breed on the plant and spread to other plants. The same is true of public KO plantings. The people who plant them probably don't check on them often and even if they do, they probably don't recognize RRD or know to get rid of the plant. I have not heard many claims that KO is more susceptible to RRD. |
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