I posted these on RC a few days ago and just finished getting them uploaded to my photo page. (The first bloom photos are in the middle of being transfered over by my service provider, so the link my no longer work.)
These are my “keepers” out of the 2006 crop of home run seedlings. I have only kept plants that have shown no signs of disease. Out of the Cal Poly crosses only one (06-73-2) remains. It might be classified as a mini-flora, time will tell. The yellow fades to white and the pink/red intensifies as the flowers age. The plant seems to bloom profusely and has a fair amount of vigor (~3 ft high).
From the Morden Sunrise crosses several have shown promise, but for the record my new favorite is 06-27-13. They seem to fall into 2 growth patterns - tall upright bushes such as 06-27-2, or I guess what is probably more like a ground cover rose (low growing, spreading more horizontally) such as 06-27-4.
Liz
Link: www.flickr.com/photos/liz_lee/sets/72157601956850172/
1 Like
I was at the Minnesota Landscape Arboretum and noticed their plant of Home Run which looked great last year is very yellow and losing leaves like mad from blackspot! Yuck! ‘Baby Love’ has a race specific resistance gene to blackspot which has been reported. Perhaps the blackspot resistance ‘Home Run’ inherited is the factor of that of ‘Baby Love’ and not whatever seems to make ‘Knockout’ so consistently resistant. It would be interesting to challenge Home Run, Knockout, and Baby Love to the same race of blackspot Roberts and other found to infect Baby Love in England. Maybe there is a new race of blackspot in the garden there? All the original Knockouts (red one) died because it wasn’t hardy enough over the years in the garden. It would be interesting to innoculate Knockout with the blackspot on Home Run to see what would happen.
David
This does not surprise me too much, vertical resistance (race specific) is far easier to breed for than horizontal resistance. This is just another example of why it is important to work with multiple forms/sources of resistant. Paul’s post on going native is a very timely reminder of this. Fortunately my home run is still spotless, baby love too.
David, I like your idea of doing the BS innoculation. I would also include the Buck roses in that experiment, all of mine have BS to varying degrees throughout the season up here. Perhaps their supposed BS resistance is to this race??
Right now my only truely clean roses, throughout the entire season, are Home Run, Baby Love, A. MacKenzie, John Cabot, and William Baffin. This is my first season with Aprikola, and it is looking great, so I might be able to add it to the list as well. Unfortunately I can not group Morden Sunrise into that group as it starts showing signs of BS in late Sept.
Liz
Knock Out is apparently prone to blackspot in upstate NY.
I think the best we are going to be able to do is to try to breed to stay ahead of the game in terms of disease resistance, just as new drugs have to developed to stay ahead of human disease.
I wish I could get some of my seedlings into high disease pressure environments for testing.
I think you’re right Liz. Our only hope is to introduce multiple forms of resistance and to keep at it.
One of the things I seek to do is avoid using the same roses most others are using.
Here in my MD garden both Baby Love and Home Run get BS pretty bad. However Knock Out stays clean.
Robert, I was wondering, if Knock Out in upstate NY really gets BS or it could be downey mildew. I saw KO with downey mildew in CA last year.
Olga
Hi Olga, It’s definitely Black Spot for Knock Out in upstate NY. My friend there breeds for Black Spot resistance so he would know.
Knock Out suffers badly from Powdery Mildew in Southern CA.
Home Run and Baby Love seem to be immune from P.M. here so far.
Wow David - I am sorry to hear about ‘Home Run’ getting BS!
Maybe I should just stick with breeding for PM resistance since that is what we mainly get here…
BTW, I noted early on while using BL, that it was highly susceptible to downy mildew here - almost an indicator plant! I have seen the same susceptibility in many of its seedlings…
Jim Sproul