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Tamora.
This rose is stated to b highly disease resistant. Well, maybe it is in some locations. For nearly two years now, mine have been badly infested with black spot despite my (somewhat erratic) attempts to control it. This despite an open location with excellent air circulation. Currently, they are almost completely defoliated. and I have recently started a very aggressive spraying program. It's not just me. There has been a plague of black spot all over Texas. Why? Don't know. I am in Houston (Zone 9a), with hot and humid summers.
J.F.
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#1 of 9 posted
17 MAY 09 by
Unregistered Guest
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I HAVE SEVERAL TAMORAS IN MY GARDEN AND I AM QUITE PLEASED WITH THEM. HOWEVER, CONTRARY TO POPULAR BELIEF MOST ROSES ARE NOT HOT CLIMATE PLANTS. BY THAT I MEAN THAT MOST ROSES GO INTO A DORMANT STATE ABOVE APPROXIMATELY 85 DEG F. MY ARDEN IS LAYED OUT SO THAT ALL MY ROSES GET SHADE AT THE HOTEST PART OF THE DAY AND DIRECT SUNLIGHT ONLY IN THE EARLY MORNING AND AFTERNOON. ALMOST ALL ROSES ARE FUNGUS SESCEPTABLE, INCLUDING BLACK SPOT, AND DO NOT BELIEVE ANY LIE TO THE CONTRARY ! ! ! YOU MUST USE A FUNGICIDE ! ! ! TWO GOOD ONES THAT I HAVE AND ARE CURRENTLY USING ARE HONOUR GAURD (PROPICONIZOLE CONCENTRATE) WHICH I HAVE FOUND TO BE THE BEST AND ORTHENEX BY ORTHO, ALSO A PESTICIDE. IN A CLIMATE LIKE YOURS YOU MUST SPRAY EVERY 7 DAYS ! ! ! I KNOW WHAT I AM TALKING ABOUT. MY GARDEN CONSISTS OF ABOUT TWO HUNDRED ROSES THAT BLOOM BEUTIFULLY AND CONSISTENTLY. MY KNOWLEDGE HAS BEEN GAINED BY GARNISHING FROM BOOKS WHAT IS TRUE, GETTING RID OF WHAT IS NOT TRUE AND BUILDING ON THAT KNOWLEDGE BASE. JUST REMEMBER NOT ALL INFORMATION CONTAINED IN BOOKS ABOUT ROSE GROWING IS TRUE ! ! ! SOMETINES PEOPLE ADD INFORMATION TO BOOKS WITHOUT DETERMINING IT'S VALIDITY. GOOD LUCK ! ! !
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From the perspective of one who worries about the planet: a plant that needs weekly spraying isn't worth growing. There is also your own health to consider. I garden in a mediterranean climate, but if I were in a black spot zone, I'd look for roses that weren't susceptible, or choose something other than roses. I don't use pesticides in my rose garden, either. It's possible to buy natural predators.
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#3 of 9 posted
14 MAR 11 by
CarolynB
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I totally agree! It's wonderful to grow beautiful flowers, but not at the cost of what weekly spaying is likely to do to your neighbors' health and your own health. It's better to choose roses and other plants that are disease resistant, and rarely if ever need spraying.
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#4 of 9 posted
29 JUL 14 by
 nbate
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I have Tamora growing beautifully in only 3 hours of sun, 11:45 - 3:00. I spray with Heritage and Mancozeb every 2 or three weeks. I live near Indianapolis. Tamora produces, 7 or eight blossoms with each flush. It died down to the bud union last winter, so I am thrilled with it now. I prune to less than a foot after a blossom is spent. I grow it in a pot on a terrace. The fragrance is very strong and unusual.
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Nearby rose park has Tamora and they didn't know that Tamora like it alkaline .. they put sulfur on Tamora .. that broke out in blackspots immediately. Their Tamora is grafted on Dr. Huey (that rootstock likes alkaline clay). Their Tamora bed is a blackspot fest, after granular sulfur application, despite spraying. There's really no point in spreading sulfur when the pH of rain is 5.6, quite acidic. Rain on the east coast is even more acidic, google "acid rain" and you'll see the effect on plants.
See "Environmental reasons for NOT spraying" in Organic rose forum. From May 13, 2013 research article : "New research published in the Journal Neurology further supports the link between pesticide exposure and Parkinson’s disease.
http://ecowatch.com/2013/05/30/pesticide-exposure-increases-risk-parkinsons-disease/
Besides the fungicides maneb and mancozeb (UP the disease by 33 percent to 80 percent), another pesticide is linked to Parkinson's disease:
"New research shows a link between use of two pesticides, rotenone and paraquat, and Parkinson's disease. People who used either pesticide developed Parkinson's disease approximately 2.5 times more often than non-users.
The study was a collaborative effort conducted by researchers at the National Institute of Environmental Health Sciences (NIEHS), which is part of the National Institutes of Health, and the Parkinson's Institute and Clinical Center in Sunnyvale, Calif."
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I would like to point out that this site is specifically devoted to roses.
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Fair point, but if people are taking risks by spraying said roses then pointing out the risks is probably not out of line. I think it could fairly be included under rose cultivation.
Although interpreting scientific studies can be more complex than some would like it to be.
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Thank you, Give me Caffeine for your fairness. Yes, I did talk about Tamora rose. A safer approach would be using dolomitic lime (has both calcium and magnesium) for roses that like alkaline, rather than spraying with chemicals.
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I wouldn't argue that dolomite isn't safer. I'm not sure how good the available studies on fungicides and pesticides are though. Methodology is going to be critical to getting useful results there. For a start, it'd be almost impossible to find a group that used one compound* but didn't use others. You'd also have to account for all sorts of lifestyle and genetic factors that could have an effect.
*I'm not keen on the word "chemicals". I regard it as basically meaningless. For example, is NaCl a chemical or not? What about KCl? What about HCl? What about KCSN? By what standard would NaCl from some sources not be "a chemical", while HCl from some sources would?
Really, all the most people mean by "chemical" is "something I don't like the sound of, and probably don't understand anyway".
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