Search found 375 matches

by david zlesak
Mon Apr 06, 2020 4:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 17
Views: 476

Re: Unique black spot resistance gene from 'George Vancouver' is better characterized

Hi Marty, I'm looking through my notes for roses I tried to do chromosome counts on. I want to redo Grand Amore to make sure, but out of what I could tell from the better spread cells it looked like Grand Amore was triploid. Maybe that could be contributing to it being a challenging female. I'd love...
by david zlesak
Mon Apr 06, 2020 10:40 am
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 17
Views: 476

Re: Unique black spot resistance gene from 'George Vancouver' is better characterized

We have a race here in MN/WI that overcomes Rdr3 ('Sunsprite' and 'George Vancouver') too and is very widespread now throughout the region. Years back I used 'George Vancouver' a lot, but then when the race swept through it and most of the seedlings went down pretty hard. For Rdr4 Brite EyesTM gets ...
by david zlesak
Thu Mar 19, 2020 10:41 am
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 17
Views: 476

Re: Unique black spot resistance gene from 'George Vancouver' is better characterized

That's a great question Plazbo. Yes, that sounds like a good plan and what Will I think has done in his work in some of his lines. As he takes his healthier key parents that likely have multiple dominant genes and cross them with standard modern roses that for instance have unique colors (like to br...
by david zlesak
Mon Mar 16, 2020 7:11 pm
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 17
Views: 476

Re: Unique black spot resistance gene from 'George Vancouver' is better characterized

Good point about R. multiflora. That is where Debener first got Rdr1 from and characterized it. They followed the gene through generations. There was chromosome doubling along the way as they got the gene introgressed into some tetraploid modern rose hybrid genetics. Due to the pattern of infection ...
by david zlesak
Mon Mar 16, 2020 3:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 17
Views: 476

Re: Unique black spot resistance gene from 'George Vancouver' is better characterized

Good question Don. There isn't a good complied list of roses for each Rdr. That would be great to develop as we use the markers developed for each gene to test more cultivars. This list for Rdr3 I suspect is the most extensive list for any of the Rdr genes to date as we surveyed a number of roses to...
by david zlesak
Fri Mar 13, 2020 1:21 pm
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 17
Views: 476

Unique black spot resistance gene from 'George Vancouver' is better characterized

Hi Everyone! It has been a long path to get to this point. We learned that the black spot resistance gene in 'George Vancouver' is in a unique portion of the rose genome compared to the other characterized genes to date, we developed some DNA markers to test for Rdr3, and tested some additional rose...
by david zlesak
Thu Mar 12, 2020 12:33 am
Forum: Rose Hybridizers Association Forum
Topic: Annual NCPNR Meeting July 22-23, 2020 Minnesota Landscape Arboretum
Replies: 3
Views: 113

Re: Annual NCPNR Meeting July 22-23, 2020 Minnesota Landscape Arboretum

No news yet. Since it is in July, hopefully by then things will be better for travel. UW-River Falls where I teach just decided to suspend in person classes beginning Monday through at least April 10th. We will try to navigate converting all classes the best we can to online. It'll be hard for field...
by david zlesak
Wed Feb 19, 2020 12:37 am
Forum: Rose Hybridizers Association Forum
Topic: purple stamens
Replies: 18
Views: 657

Re: purple stamens

Years ago I raised selfed seedlings of Carefree Beauty (only rose in the landscape with no other roses anywhere nearby) and a limited number of seedlings had purple/pink filaments and anther edges. It seems like at least the kind of stamen coloration that CB gives in this regard is recessive. CB doe...
by david zlesak
Wed Jan 29, 2020 10:17 am
Forum: Rose Hybridizers Association Forum
Topic: Petite Knock Out Rose - AVOID
Replies: 31
Views: 1578

Re: Petite Knock Out Rose - AVOID

This rose is sure beautiful. I saw some plants this past summer. Petite Knock Out is introduced at Zepeti (means the small) in Europe https://meilland.com/en/zepeti-an-innovation-in-the-world-of-roses/ With Europe regulating CRSPR editing as GMO's and this new rose introduced in Europe, it shouldn't...
by david zlesak
Sun Jan 26, 2020 1:19 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose Rosette Disease
Replies: 1
Views: 124

Re: Rose Rosette Disease

Hi RBx, I hope so too. Additionally, R. rugosa seems promising too. There have been some instances some R. setigera plants (that while not overly symptomatic) have tested positive for RRD. Perhaps the virus can still live and multiply to some extent at times in some of these resistant or tolerant ro...
by david zlesak
Fri Jan 24, 2020 10:05 am
Forum: Rose Hybridizers Association Forum
Topic: When to expect Rugelda F1 first blooms
Replies: 22
Views: 1739

Re: When to expect Rugelda F1 first blooms

Hi Duane! Most all of the Above and Beyond seedlings do not have juvenile bloom. Some once mature are more freer flowering. A&B is a cross of a mini and a species hybrid (R. virginiana x R. laxa). So, we can guess it has rrRR (R is one time bloom, r repeat) for the primary gene that generally govern...
by david zlesak
Wed Jan 08, 2020 1:47 pm
Forum: Rose Hybridizers Association Forum
Topic: Protoplast Fusion
Replies: 7
Views: 285

Re: Protoplast Fusion

Hi Karl! It would be great if there was more momentum with protoplast fusion in roses and follow up papers on characterizing these putative fusion hybrids, if they still exist. From my memory I think I came across something at some point that questioned if these plants were really fusion hybrids, bu...
by david zlesak
Sun Jan 05, 2020 4:20 pm
Forum: Rose Hybridizers Association Forum
Topic: non rose plant from Zlesak
Replies: 9
Views: 227

Re: non rose plant from Zlesak

That's a great point about a critical biomass maybe being important for rebloom for them Larry. They were little plants when I sent yours in 4" pots. Some seedlings of Sweet Cherry Tea bloomed the first year, but only when I pushed them with starting them early (germinated January I think) and got a...
by david zlesak
Sun Jan 05, 2020 12:43 pm
Forum: Rose Hybridizers Association Forum
Topic: non rose plant from Zlesak
Replies: 9
Views: 227

Re: non rose plant from Zlesak

That is really interesting Larry and a great question. I think the plants I sent you were cuttings from late 2018 that I grew in the greenhouse through the winter and likely confused some before sending them to you come spring. It'll be great to learn what they'll do this coming season for you in re...
by david zlesak
Sat Jan 04, 2020 10:54 am
Forum: Rose Hybridizers Association Forum
Topic: non rose plant from Zlesak
Replies: 9
Views: 227

Re: non rose plant from Zlesak

Thank you Henry :0). I really like this ninebark seedling because it reblooms with flowers at the terminals midsummer and on and that forces branching from beneath and nice warmly colored shoot tips without pruning. Consistent and strong rebloom in ninebark is not something I've seen in other cultiv...
by david zlesak
Sat Jan 04, 2020 10:40 am
Forum: Rose Hybridizers Association Forum
Topic: North American Rose ID?
Replies: 3
Views: 203

Re: North American Rose ID?

Dear Matt, That is a great question. If you post pictures, hopefully some of us can help you the best we can. Dr. Walter Lewis is the foremost expert. Here is a link to part of the Flora of North America Rosa section he put together. There is a series of books and he put together the Rosa section wh...
by david zlesak
Tue Dec 24, 2019 6:18 pm
Forum: Rose Hybridizers Association Forum
Topic: Freedom Gardens is a source for rare roses
Replies: 6
Views: 850

Re: Freedom Gardens is a source for rare roses

Thanks Dane, I have 'Max Graf' fortunately and we are using it in the study too. I got it years ago from Pickering in Canada and have been able to keep plants going of it since through various moves. It is a little tender dying down to the ground in harsh winters. It is described as near sterile and...
by david zlesak
Sun Dec 15, 2019 1:02 am
Forum: Rose Hybridizers Association Forum
Topic: Polyantha rose plant named ‘Zlepoltwo’
Replies: 2
Views: 166

Re: Polyantha rose plant named ‘Zlepoltwo’

Thank you Henry for posting this. Yes, it is Pretty Polly White Joe :0). It was a seedling back about 20 years ago. I really like it because of the relatively dark green leaves and abundant white flowers. It is near thornless on the stems, but still has prickles on the undersides of the leaves. It s...
by david zlesak
Mon Dec 02, 2019 8:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Chip Budding Questions
Replies: 4
Views: 247

Re: Chip Budding Questions

Hi Matt! Those are great questions. Grafting/budding/chip budding interestingly was the topic today for the Plant Propagation class I teach. We talked about T budding and chip budding and the advantage of chip budding since it can be done over a much wider time period. The bark does not need to be "...
by david zlesak
Sat Nov 02, 2019 10:13 pm
Forum: Rose Hybridizers Association Forum
Topic: Northern Accents® ‘Lena’, ‘Ole’, ‘Sigrid’, and ‘Sven’: Four
Replies: 7
Views: 1298

Re: Northern Accents® ‘Lena’, ‘Ole’, ‘Sigrid’, and ‘Sven’: Four

I'm excited Dave Schulte has picked up the series and has enough 'Sven' ready to sell. Hopefully the other 3 will be ready to add to their offerings soon. I had a great visit with him and his wife about their efforts to make them more widely available again. Dave has a strong passion for a wide rang...