2012 rose disease slide show

henry_kuska

11 years ago

See:

http://pnwdistrict.org/pdf_files/Diseases%20of%20Roses.ppt#1

Here is a link that might be useful: link for slide show

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Comments (6)

User
11 years ago
I'm disappointed: by slide three we have already encountered ye olde "spraying is the solution" approach, and the recommendation to: select cultivars that are known to be highly resistant to disease isn't offered, except as a half-hearted, brief mention on slide 10, in which the option to buy disease free types is spoken of as if its not really the answer. The answer, as we all know, is spray, spray, spray! Ugh.

At least they did note that Roundup damage can mimic Rose Rosette Disease, which is something.

PS: if my comment is seen as being unnecessarily negative, I can understand that, but after fifteen years of lugging around hundreds of gallons of fungicide on my back just to keep my roses looking "healthy" (as opposed to actually being healthy), I have taken a rather dim view of the whole "better living through chemistry" paradigm of rose cultivation. (and no, I don't do the spray thing anymore) If you can't grow in my garden without fungicide and pesticide dumped on you every 10 days, you ain't welcome in my garden!
lucillle
11 years ago
Trospero, I totally agree with what you are saying about choosing resistant varieties.

Of course, the choice should always be available, there are some varieties of roses which are beautiful but high maintenance, but all of us have people, critters, or things in our lives from time to time that are high maintenance.
But I'm venturing a guess that there may be some lobbying going on by special interest groups, i.e. huge powerful conglomerates that include chemical companies which produce pesticide, as well as perhaps rose vendors who sell varieties susceptible to bugs and blackspot to account for the slides.

It's all about choice, but both sides, spray and not spray, in my opinion, should be represented and it is the individual rose grower that should make her choice. The choice should not be made for her (or him) by not providing enough info to make an informed decision.
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The ARS is funding a three year study at the University of Tennessee. Objectives include trying to develop an ELISA test and studying the spread within garden conditions of a garden composed solely of a single cultivar (way out in the country where there are no rose gardens down wind). They have as RRD source plants severely infected plants of the same cultivar. I haven't heard the results of the first year, yet. ----------------- re R. rugosa. Early on, in the garden we followed at Lincoln Memorial University, there was also a plantings of many Pink Grootendorsts near a building that had been the Dairy. They did not get sick for several years as the modern roses planted immediately downwind of multiflora-rich field whose plants were at least 30%infected with RRD. At one time we found some strange swellings on the PG canes, and they made the rounds of a number of Plant Pathologists; no idea what their problem was, but it was just the swelling. Then five or six years in, a plant got two canes that were even more thorny, whose new growth spiraled, whose leaf margins were different and whose blooms were messed up badly. Now I wish I had made scans of the canes, but we were busy with other plases of following the disease as it spread. The problem with the declarations that certain roses don't get RRD is that no one has ever taken the spectrum of all roses species and planted them in different USDA zones and left them in high disease pressure areas for a five to seven year period. What I've seen this winter, when where I live is zone 7 low temperatures, is that the plants with RRD have grown through winter....at least the parts with RRD have. The uninfected canes have gone semidormant. There's so much that we don't know. Here is a link that might be useful: Rose Rosette E-book
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That is a great PP Presentation. Everyone should save it on their computer. The range for RRD may be a bit outdated, but the info is good, especially the pictures of herbicide drift damage.
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I'm not sure why they would do this......the diseases that affect roses are NOT the same diseases that affect grapes. While they both get powdery mildew, it is two different species of fungal organisms that affect these plants - rose PM is Podosphaera pannosas and grape PM is Uncinula nacator. One does not necessarily translate directly to the other!! btw, there are an awful lot of vineyards in my area and I've yet to see one that had roses growing adjacent to the grapes. This sounds more like a gardening myth....much along the lines of companion plantings.....than anything that has a scientific basis :-))
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catsrose
11 years ago
The photos and descriptions are very good for everything except RRD, which leaves out several other identifying features like the witches broom and the multitudes of large, soft prickles seen on many roses. And I agree with the above on the care--it sounds like the authors work for a fungicide company. But I, too, am no-spray.
User
11 years ago
Lucille,
If I gave the impression that I was telling other people not to spray, that was absolutely not my intention. I apologize if that is how it sounded. I was speaking only to convey my own feelings about the matter, not to issue a directive to others.

Although I no longer use fungicides on my roses, I am absolutely not going to tell anyone else they shouldn't use them. That is not my place. If a person wants a garden full of modern styles and they want immaculate foliage, that is their choice, and in many parts of the world the only way to accomplish that is by using fungicides. I used to have a gorgeous archive of the Ralph Moore roses (about 350 varieties) and this was a spectacular display in the garden, but it required a non-stop barrage of fungicides from April through October (although I could get away with doing it less often during July and August) in order to remain looking healthy, and to keep the plants performing to their potential. Now that I no longer use fungicides on them, they have almost all dwindled to sad plants 1/4 their size, bloom quality is severely diminished, and few of them keep their foliage for long. Because of this I have decided to decommission the collection this coming spring. I'm sad to be letting them go, but I won't get that sprayer out again.
lucillle
11 years ago
Trospero, you did not give that impression at all, that you were commanding others. I agree with your feelings, and also feel that if people do want to take the time to do the spraying it's up to them.
lookin4you2xist
11 years ago
Trospero, I can relate to the massive Ralph Moore collection. I do not spray either. I just put everything on Fortuniana here in Tampa Bay, I had no real choice if I didn't want my misting system up 24/7. If I do spray, possibly once every 5 years, it is with the gentlest stuff I can find. I get burnt out on them every few years. Thankfully Winter always gets me back in the garden! Happy Holidays!
Regards,
Andrew Grover
St. Pete Fl

2012 rose disease slide show

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