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'RSM 104' rose Reviews & Comments
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Initial post
29 MAR 24 by
 Michael Garhart
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Possibly a parent of the CA60 rose listed in several studies regarding blackspot resistance at Agricultural and Agri-Food Canada’s (AAFC) Morden Manitoba research station.
CA60 is listed as:
"‘CA60’ (23104FR2) was an experimental rose developed at
the Agricultural and Agri-Food Canada’s (AAFC) Morden Manitoba research station from the
50
cross ‘RSM 104’ × ‘Frontenac’."
The serials for most of these newer hybrids tend to read as batch set (23) seed parent (104) pollen parent (FR) and seedling # of batch set. A ton of hybrids from their codes now read this way.
Anyway, this rose is probably responsible for some of their BS resistance breeding, so important to take note of. CA60 is not listed on HMF. If they gave a photo of CA60, I would go to the effort of asking for it to be listed, but I have no idea of its stats or looks. Based on the seedlings shown, I would imagine its a pink-red and double type.
The fact that Rosa multiflora is mentioned a lot in these studies leads me to believe its possible that 104 is a close, dwarf, repeating descended of selections to parse out black spot resistance since Rosa multiflora is a known source of widely varying resistances.
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#1 of 2 posted
29 MAR 24 by
Margit Schowalter
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Micheal
Both 91-100-1 and 91-104-1 were Debner selections growing at the Morden Research Station. These codes are accession numbers. Received in 1991, the100th and 104th plants received at the station, quantity one.
The seedling 23104FR2 code means
23 = cross made in 2003
104 = mother 91-104-1
FR= pollen parent Frontenac
2 = 2nd selected seedling from that cross
This coding system was used at both the Ottawa Station by Dr. Svejda and the Morden Station by Henry Marshall and it was carried forward by later breeders..
CA60 is an arbitrary name re-assignment made by a group of nurseries known as the Canadian Artist Rose Consortium who were awarded rights to several of the Agriculture and Agri-Food Canada (AAFC) roses in 2003. They later introduced the 5 roses known as the Canadian Artist Series.
CA = Canadian Artist rose material
It is my understanding 91-104-1 has been the subject of a study at a Canadian University but I would have to do some research to locate that information.
Hope this helps.
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#2 of 2 posted
1 APR 24 by
Michael Garhart
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Yup. Makes sense. I would like to find the source for 104 in fuller detail as it examples the importance of health in roses, but this is good enough for now.
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