Possible Rosette Disease - what to do?
Artist-FKA-Novice Zone 7B GA
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rifis (zone 6b-7a NJ)
last yearrifis (zone 6b-7a NJ)
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Rose Rosette Disease question?
Comments (12)Hi. Jim Amrine and his students are the ones who worked with the mites. Jim thinks that to get the (now we know it's a) virus into the vascular system of the rose, the move is through the cheliceral stylets of the mites. There are also two appendages that sort of look like "hands" in that they have a stalk and a bunch of things that emerge from the bottom of the stalk. Those things can just whir when the mite decides for them to. I don't think anyone knows why. Just translating our thoughts to something that small whose mind is probably a series of if-then statements, and not much more. Can we outwit something that has no wits? Jim is the one who came up with the very logical idea that if the stylets get into undifferentiated meristemic tissue, and put the virus there, then the virus can get into the vascular system. Getting the virus into a pre-existing phloem cell is almost impossible otherwise, because there is no part of the mite that is long enough in microns to reach into the plant into the phloem. In my ebook, take a look at the line drawing of the mite. Now to put that into a size that you know. That mite is the size of a bedroom slipper that would fit on one aphid foot. From what I've read frass transmission of viruses is known for beetles and one of the professors who studied RRD in Arkansas also did the beetle frass work. Check Dr. Rose Gergerich for references. The only cut apart body view of an eriophyid mite that I recall is in a book called Eriophyideae. Just cutting a microtome section through a mite so that it's along the middle of its back AND vertical must have been a challenge. IIRC, the animal has a relatively short digestive tract. It has no respiratory system-that's done through the 'skin'. To opuntiamc's original questions: I know several people who have been devoted insecticide and miticide sprayers. They have continued to have RRD infections. They have made major efforts to remove infected 'wild' roses in the fields around them. Remember we call spider mites and eriophyid mites ....we call them both mites. But there are so many physical differences ...size, predators vs. objects of predation, number and location and articulation of legs, response to us and movement, etc. Even within eriophyids, there are some major differences. The mites that include the RRV vector potential live very differnt lives from the mites that make the galls on oak leaves...even on poison ivy leaves. poison ivy leaf galls What has recently interested me is that the leaves with galls are not widespread on a plant but only on a few and I wonder what we can learn/infer/guess is happening. The one part of the country that hasn't had RRD as much as it 'should' have is the area in the Delta where there was a major spraying program against boll wevils. That eradication program has stopped, so time will tell If it has a positive effect. The -cides have one big negative: their targets develop tolerance and the -cides stop working. Air flow modification does work if you have the room; removing one sick cane earliest...can work some of the time and some of the time beats none of the time, and maybe some of the very small predaceous thrips and mites will continue their hunger for the eriophyids. Ann...See MorePossible rose-rosette disease on knockouts?
Comments (12)Just for some extra information, these roses are in a dedicated, elevated bed in my backyard, and were planted at *least* five years ago. We are in a nice suburb of Oklahoma City, and the roses have required only minimal care. I've heard anecdotally that knockout roses have been a bit under seige with various diseases in this region since last summer, but until now ours had been trouble-free and thus saw no reason to do anything special to them. My lawn receives only a twice-yearly dose of 34-0-0 fertilizer and weed control in spring and pre-fall. The neighbor to my south has a much more extensive backyard garden and I have no idea what he may be applying, if anything. With prevailing southerly winds, blow-over of anything he uses into my yard is not at all inconceivable. The only other plants in my backyard are two mature crepe myrtles in the corners and a raised vegetable garden bed some 30 feet away. It sounds to me like there is enough uncertainty here such thatI'll probably keep the roses this season and see if any new, more normal growth emerges. Any additional input is much appreciated....See MoreRose Rosette Disease
Comments (86)The whole issue is potentially really quite terrible. Weeks brought "research material" into their production fields and propagated it beside roses they made for sale to the public. Some of that material was infected with RRD. That was four, perhaps longer, years ago. It can take several years for RRD to manifest itself. In the several years since the initial infection, bud wood, cuttings and bare root plants have been distributed to virtually every commercial rose source in the US as well as abroad. That means, worst case scenario, there are RRD time bombs at every production source of roses in this and perhaps many other countries. By now, who knows how many Weeks roses (and other varieties they propagated) may have been exposed? Perhaps none. Perhaps... Yes, if no one buys, the industry and its members suffer and perhaps fail. How much of a gambler are YOU? If I had a yard full of roses I could easily replace and if RRD existed outside my fences, I may feel differently. I don't and it doesn't....See MoreBoth of my roses have Rose Rosette Disease
Comments (12)I am SOOOO sorry to hear. RRD was one of my concerns that sorta kept me growing roses years back Right now, I think I might have boxwood blight. Took some cuttings for analysis to get confirmation. Sadface on , as these boxwoods I have nurtured since they 3G sized to full grown....and they grow like a measly few inches per year at most. I hate the diseases we speak about cause it's not a single plant virus/disease. It can setback your hardscape by wiping out X Y Z...See Morerifis (zone 6b-7a NJ)
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