Search found 84 matches

by dgermeys
Wed Jun 26, 2019 12:17 pm
Forum: Rose Hybridizers Association Forum
Topic: Cercospora
Replies: 8
Views: 716

Re: Cercospora

Does anyone know of botanical roses that don't get it, or only get it a little bit?
by dgermeys
Wed Jun 05, 2019 12:36 pm
Forum: Rose Hybridizers Association Forum
Topic: Fritz Nobis
Replies: 5
Views: 500

Re: Fritz Nobis

Confirmed, the rose is John Grooms, introduced 1993 by Peter Beales, parentage is Fritz Nobis x Compassion. I've put in a comment with HMF - hopefully they will update the parentage info. Thank you for the information! I bought F.N. this year and the rose is growing well and seems very healthy. Pro...
by dgermeys
Thu Feb 28, 2019 5:48 pm
Forum: Rose Hybridizers Association Forum
Topic: The volume of Acta Horticulturae with rose articles from the meetings in Angers France is out!!
Replies: 3
Views: 193

Re: The volume of Acta Horticulturae with rose articles from the meetings in Angers France is out!!

Seems really interesting David! I am interested in one article in particular, about the CS: "Resistance of garden roses to cercospora leaf spot" The abstract states that 6 cultivars showed no cercospora symptoms. Does anyone has access to the full article. It would be really nice to know which 6 cul...
by dgermeys
Fri Feb 22, 2019 5:07 pm
Forum: Rose Hybridizers Association Forum
Topic: Fritz Nobis
Replies: 5
Views: 500

Re: Fritz Nobis

anyone who had success using this rose?
by dgermeys
Fri Feb 22, 2019 4:21 pm
Forum: Rose Hybridizers Association Forum
Topic: R. moyesii 'Highdownensis'
Replies: 36
Views: 4102

Re: R. moyesii 'Highdownensis'

Hi guys, I finally found the time to read the article "Dr. Hurst's Rose Classification" by Eileen Whitehead Erlanson. The article seems to confirm Hurst was right. Maybe he didn't classify all roses into the right categorie, but he did an amazing job classifying all those traits and linking to the s...
by dgermeys
Tue Jan 22, 2019 12:34 pm
Forum: Rose Hybridizers Association Forum
Topic: R. moyesii 'Highdownensis'
Replies: 36
Views: 4102

Re: R. moyesii 'Highdownensis'

Keep in mind that Hurst's genetic concepts are archaic relative to the state of the art and that that Earlinson disproved his septet hypothesis eighty years ago. Don (or anyone else), can you give me the paper or title of this paper where Earlinson proves the septet theory to be wrong for roses? Th...
by dgermeys
Fri Dec 07, 2018 7:07 am
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 800

Rebloom

Quite often we read in catalogues terms as continual flowering, repeat flowering, reblooming, and even 'occasional' flowers later in the season. How is this variety of different types of rebloom explained? Especially the 'occasional rebloom later in the season'? We have all learned that the rebloomi...
by dgermeys
Sun Aug 05, 2018 5:49 am
Forum: Rose Hybridizers Association Forum
Topic: Cercospora
Replies: 8
Views: 716

Re: Cercospora

My rosa carolina seems to get it, but just a little
by dgermeys
Thu Aug 02, 2018 4:33 pm
Forum: Rose Hybridizers Association Forum
Topic: Rootstocks and Flower Color
Replies: 24
Views: 1815

Re: Rootstocks and Flower Color

I tend to agree with Kim. Also, because if we only have own root roses, the heritage roses, who not always perform well on their own roots will be banished entirely from the market. Don't understand me wrong, I have nothing against roses on their own roots, unless they use a lot of environmentaly da...
by dgermeys
Thu Aug 02, 2018 2:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Cercospora
Replies: 8
Views: 716

Cercospora

Does anyone has experience with roses that are resistant to cercospora? I know there have been discussions about this disease but maybe an update on this information could be interesting.
Or if you know species that are resistant, that would also be interesting!
by dgermeys
Thu Aug 02, 2018 7:14 am
Forum: Rose Hybridizers Association Forum
Topic: Disease resistance
Replies: 4
Views: 329

Disease resistance

I was wondering about disease resistance. Can roses become disistant after a while to any fungus? Is it possible that they get it when they are young but trying to fight it and somehow remember the disease and rhen after a second or rhird attack they are less infected or evwn immune ro that disease?...
by dgermeys
Thu Aug 02, 2018 6:55 am
Forum: Rose Hybridizers Association Forum
Topic: Rootstocks and Flower Color
Replies: 24
Views: 1815

Re: Rootstocks and Flower Color

Very intetesting topic! I have even heard that different rootstocks can have an influence on the scent. Makes scense to me. A multiflora rootsrock will not go as deep as a rubiginosa rootstock for example. So that will also have its influence if nutrients are deep in the soil. I believe there should...
by dgermeys
Mon Jun 04, 2018 3:36 am
Forum: Rose Hybridizers Association Forum
Topic: My First Bloom
Replies: 7
Views: 714

Re: My First Bloom

Love the colors in this flower!
by dgermeys
Wed May 30, 2018 4:31 pm
Forum: Rose Hybridizers Association Forum
Topic: First Blooms for 2015
Replies: 28
Views: 3850

Re: First Blooms for 2015

The pollination that produced this seedling was made May 25, 2009. It flowered for the first time this year (2015) on May 31. The pollen parent is an F1 moyesii, the seed parent is Persian Peach. Hi Don, that's a very interesting cross! How did it evolve? Have you other crosses with moyessi as poll...
by dgermeys
Thu May 24, 2018 3:19 pm
Forum: Rose Hybridizers Association Forum
Topic: R. gallica versus R. rubiginosa
Replies: 2
Views: 396

R. gallica versus R. rubiginosa

Hi, Today I collected some pollen in the wild from rosa rubiginosa and afterwards I saw a picture of rosa gallica complicata... Which made me wonder... Are rosa gallica and rosa rubiginosa related species? They both have glands on there sepals and the sepals show a particular pattern. What do you gu...
by dgermeys
Wed May 09, 2018 5:27 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 1198

Re: Canina Chromosome pairing

I have some ideas about which wild roses can be used on rosa rubiginosa so the f1 hybrids will be able to 'free' the fragant genes. My thinking is based on the septet theory of Hurst. But I know... most people here feel Hurst was wrong... I still believe there is some truth in his observations thoug...
by dgermeys
Wed May 09, 2018 5:18 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 1198

Re: Canina Chromosome pairing

Hey Karl. I like the way you think... I am quite surenit is possible to bring the fragent leaf genes into a tetraploid. Not sure though it is easy to obtain a fertile tetraploid though, so the genes can be passed on to its offspring... I have 2 seedlings of Magnifica, open pollination. But they are ...
by dgermeys
Wed May 09, 2018 12:13 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 1198

Re: Canina Chromosome pairing

Hi, I believe this article might be of some interest: https://link.springer.com/article/10.1007/s00606-003-0058-2 It states that "Evaluation of phenotypic variability revealed that the two taxonomically relevant characters “widening of the orifice” and “persistence of the sepals” are statistically s...
by dgermeys
Wed Apr 25, 2018 2:47 am
Forum: Rose Hybridizers Association Forum
Topic: Any merits to R. woodsii ultramontana?
Replies: 21
Views: 1794

Re: Any merits to R. woodsii ultramontana?

Thanks for the ideas, but I'm not really a fan of using weed killers or other chemicals in my rose breeding work. So I'll have to hope nature will be so kind to help me with the part of doubling of chromosones :-)
by dgermeys
Tue Apr 24, 2018 5:59 am
Forum: Rose Hybridizers Association Forum
Topic: Any merits to R. woodsii ultramontana?
Replies: 21
Views: 1794

Re: Any merits to R. woodsii ultramontana?

4. 'Schneezwerg' or 'Jens Munk' (these have superior disease resistance to other Rugosas in my experience) x Rosa woodsii could result in very cold hardy (Zone 2), disease resistant progeny that could be further used in Rugosa breeding. Perhaps there is potential to develop selections having reddis...