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#1
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Disease identification
Do anyone knows what kind of disease this is?
The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg |
#2
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Disease identification
cristina wrote:
Do anyone knows what kind of disease this is? The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg I have added two closeups: http://www.geocities.com/artyard/pia...alatclose1.jpg http://www.geocities.com/artyard/pia...alatclose2.jpg |
#3
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Disease identification
cristina wrote:
Do anyone knows what kind of disease this is? The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg This looks to me like overwatering or the results of extremes of temps or dryness and watering, if that makes sense. My stressed plants do this, such as roses that are in too-small pots that overdry then get drenched. Some may say Rose Mosaic Virus, but I don't think so. If it is, there is nothing you can do, and besides it will not kill your plant, it just makes them underperform. It is bred in, nothing you can do. Try watering your plants more consistently and making sure they are fed regularly. Or do tell us more about your cultivation practices. This does not look like mites or insect damage to me, anyway. |
#4
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Disease identification
cristina wrote:
I have added two closeups: http://www.geocities.com/artyard/pia...alatclose1.jpg http://www.geocities.com/artyard/pia...alatclose2.jpg Hmm, on the second one I see black around the main vein that looks like it might be fungal disease. Do you have an anti-fungal spray routine? |
#5
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Disease identification
On Thu, 8 Apr 2004 12:30:17 -0400 (EDT), "Shiva"
wrote: cristina wrote: Do anyone knows what kind of disease this is? The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg This looks to me like overwatering or the results of extremes of temps or dryness and watering, if that makes sense. My stressed plants do this, such as roses that are in too-small pots that overdry then get drenched. Some may say Rose Mosaic Virus, but I don't think so. If it is, there is nothing you can do, and besides it will not kill your plant, it just makes them underperform. It is bred in, nothing you can do. Try watering your plants more consistently and making sure they are fed regularly. Or do tell us more about your cultivation practices. This does not look like mites or insect damage to me, anyway. It sort of looked like cold damage to me. Perhaps a late cold snap like we got here in zone 6b might have made them protest a little. |
#6
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Disease identification
"cristina" wrote in message ... Do anyone knows what kind of disease this is? The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg That looks a whole lot like downy mildew, a VERY serious fungal problem. It spreads like wildfire and is very difficult to eradicate. The chemicals that control it are very expensive to buy (check out SubdueMaxx at www.rosemania.com) Your best bet is to radically cut off all of the new growth you can and bag it up and throw it away. Copper fungicides have some reported effictiveness, but I wouldn't bet on them totally eradicating it. It hides in the leaf axils, just waiting on the temperatures to be correct to spring forth again. Many rosarians who can't afford the high priced chemicals will cut a rose to the ground in order to try to elimate it from their gardens. It can kill whole rose gardens left unchecked. Sunflower MS 7b |
#7
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Disease identification
I concur. It looks just like
downy Mildew. Before you take r adical action check to see if you have purple/darb splotches or leasion on the main rose canes. If does then you can be sure it is Downey. This is one of those fungal diseases that doesn't show it presence just its effects. Best treatment is slash and burn. -- Theo in Kansas City Z5/Z6? "Sunflower" wrote in message ... "cristina" wrote in message ... Do anyone knows what kind of disease this is? The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg That looks a whole lot like downy mildew, a VERY serious fungal problem. It spreads like wildfire and is very difficult to eradicate. The chemicals that control it are very expensive to buy (check out SubdueMaxx at www.rosemania.com) Your best bet is to radically cut off all of the new growth you can and bag it up and throw it away. Copper fungicides have some reported effictiveness, but I wouldn't bet on them totally eradicating it. It hides in the leaf axils, just waiting on the temperatures to be correct to spring forth again. Many rosarians who can't afford the high priced chemicals will cut a rose to the ground in order to try to elimate it from their gardens. It can kill whole rose gardens left unchecked. Sunflower MS 7b |
#8
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Disease identification
cristina wrote:
Do anyone knows what kind of disease this is? The younger leafs fall down on touching and they have this strange design.... http://www.geocities.com/artyard/pia.../malattia1.jpg Thanks to all for the kind replies! To reseme, in reply to your posts: the blue spots (I forgetted to say it,sorry) are from copper treatment, actually it's possible that the plant is a littele overwatered, there are not purple/darb splotches or leasion on the main rose canes... |
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