Search found 91 matches

by dgermeys
Sat Oct 21, 2017 6:14 pm
Forum: Rose Hybridizers Association Forum
Topic: fungus Sphaceloma rosarum
Replies: 3
Views: 740

Re: fungus Sphaceloma rosarum

Thank you Betsy,
Thank you Larry. I will try to find your article in the RHA archives. Do you remember what year you wrote it?

I hope to come across some roses that are resistant to this disease.
by dgermeys
Sat Oct 21, 2017 6:10 pm
Forum: Rose Hybridizers Association Forum
Topic: Project for large rose hip X R. Pimpinellifolia. Questions..
Replies: 22
Views: 3424

Re: Project for large rose hip X R. Pimpinellifolia. Questio

Hello Sebastian, have you thought about the special combination of rosa Moyesii with rosa spinosissma? Or rosa sweginzowii with rosa spinosissima. I am not sure if the seedlings will be fertile but if it works, you would definitly get some spectacular hips... The problem though might be that if this...
by dgermeys
Wed Oct 04, 2017 5:35 pm
Forum: Rose Hybridizers Association Forum
Topic: fungus Sphaceloma rosarum
Replies: 3
Views: 740

fungus Sphaceloma rosarum

Does anyone know roses that are resistent to the fungus "Sphaceloma rosarum"? This result of this fungus are small holes in the leaves. One of my seedlings seems to suffer from this rose disease. The funny thing is that she seems not to suffer from blackspot very much though. So I was wondering if a...
by dgermeys
Sat Sep 09, 2017 2:12 am
Forum: Rose Hybridizers Association Forum
Topic: China studs and blackspot
Replies: 11
Views: 1423

Re: China studs and blackspot

Thx for the info! Seems a very interesting, although a bit expensive book.
by dgermeys
Fri Sep 08, 2017 3:05 am
Forum: Rose Hybridizers Association Forum
Topic: China studs and blackspot
Replies: 11
Views: 1423

Re: China studs and blackspot

Thx for correcting that Christopher. I had my reference from an old paper by de Vries and Dubois from the Second International Symposium on Roses, where they mention the "four diploid 'Stud' China's". http://edepot.wur.nl/24387 That is why I thought them to be diploid. In their table 2, after Stewar...
by dgermeys
Thu Sep 07, 2017 5:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Rosa arvensis breeding
Replies: 21
Views: 2077

Re: Rosa arvensis breeding

I can confirm that arvensis Splendens is indeed very shade tolerant. I gave it almost no sun, and yet it performed very well. Now lately, at the end of august it started to grow very long runners. From all the roses I am currently growing, this rose is the most healthiest one. I am though wondering ...
by dgermeys
Thu Sep 07, 2017 5:21 pm
Forum: Rose Hybridizers Association Forum
Topic: China studs and blackspot
Replies: 11
Views: 1423

Re: China studs and blackspot

Hi, it is just something I was wondering about. But as some of you suggested, it might be due to the combination of the two. The Chinas were probably happy in their own climate but probably not ready to 'fight' the harsh, cold and moist environment of Europe? Although, honestly, I have no idea what ...
by dgermeys
Tue Sep 05, 2017 1:06 pm
Forum: Rose Hybridizers Association Forum
Topic: China studs and blackspot
Replies: 11
Views: 1423

China studs and blackspot

Hi everyone, I have a question about the 4 China studs, the 4 roses that came from China and are said to be responssible for the reblooming qualities of a lot (not all though) of our garden roses. Does anyone of you grow them, and, are they prune to blackspot? Could it be that together with the rebl...
by dgermeys
Tue Aug 29, 2017 11:29 am
Forum: Rose Hybridizers Association Forum
Topic: video how to cross pollinate roses
Replies: 4
Views: 694

Re: video how to cross pollinate roses

Hey Jonathan, you also talk abiut rosa palustris, the swamp rose. If I understood correctly, this rose won't rot if the roots stand in water, e.g. during winter time. But can it handle heat as well, or does it really need moisture and a lot of rain?
Thx!!
by dgermeys
Mon Aug 21, 2017 11:57 am
Forum: Rose Hybridizers Association Forum
Topic: Hybrid Musk Kathleen
Replies: 37
Views: 4984

Re: Hybrid Musk Kathleen

Hi If I am not mistaken, some hybrid musks do not have even musk genes or only a very small amount. Rosa multiflora was used to create the same effect. You might want to try working with Heavenly Pink or maybe Dinky. I have not used them but I believe, if you would use the pollen on Kathleen you mig...
by dgermeys
Mon Aug 14, 2017 6:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Hyb Kordesii X Hyb Spin
Replies: 12
Views: 1177

Re: Hyb Kordesii X Hyb Spin

Hey Warren. Did you work with thus seedling in further crosses? Or with any other spin hybrids?

Dane.
by dgermeys
Sun Aug 13, 2017 5:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Spinosissima Hybrids
Replies: 10
Views: 1537

Re: Spinosissima Hybrids

I can confirm some spinosissimas at the Belgiam coast do bloom now in august. Not the thousands of flowers I saw in May but there are a few flowers here and there, especially with plant that have no or only a few hips from the last bloom.
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P_20170813_174915.jpg
by dgermeys
Sat Aug 12, 2017 3:54 pm
Forum: Rose Hybridizers Association Forum
Topic: Spinosissima Hybrids
Replies: 10
Views: 1537

Re: Spinosissima Hybrids

A friend of me told me today he went into the dunes yesterday and saw some duneroses, spinosissimas reblooming. So it seems some of them have reblooming genes. I will check this out this week and take some pictures.
by dgermeys
Thu Aug 10, 2017 4:34 pm
Forum: Rose Hybridizers Association Forum
Topic: Spinosissima Hybrids
Replies: 10
Views: 1537

Re: Spinosissima Hybrids

Hi all, Thank you all very much for your replies! Yes Lydia, the scent is one of the reasons why I love the spinosissima's! Johannes, I didn't know rosa 'altaica' does rebloom. Do you think other spinossissimas in the wild would do this as well? I read somewhere on a Dutch site that rosa spinosissim...
by dgermeys
Thu Aug 10, 2017 1:38 pm
Forum: Rose Hybridizers Association Forum
Topic: Rosa moschata breeding options
Replies: 4
Views: 827

Re: Rosa moschata breeding options

Hi,
Maybe you want to have a look at the website if Lens roses. Louis Lens used to do a lot of work with musk hybrids during the former century. A lot of his breedings are still sold at Lens Roses http://www.lens-roses.be/html/home.dhtm ... language=E
by dgermeys
Tue Jul 18, 2017 3:35 am
Forum: Rose Hybridizers Association Forum
Topic: Spinosissima Hybrids
Replies: 10
Views: 1537

Spinosissima Hybrids

I would like to hear about your experiences with spinosissimas and spinosissima hybrids. I am thinking about roses as - Karl Förster (Kordes) (occ. repeat) - Paula Vapelle (Ivan Louette) (occ. repeat) - Kakwa (John Alexander Wallace, Canada) - Robbie Burns (Austin) - Lochinvar (Austin) (repeats?) - ...
by dgermeys
Fri Jul 07, 2017 6:02 am
Forum: Rose Hybridizers Association Forum
Topic: Magnifica (rubiginosa hybrid)
Replies: 3
Views: 545

Re: Magnifica (rubiginosa hybrid)

Thank you Kim,
but still... I doubt it is pentaploid, when you look at it's parentage, it would make more sense to be hexaploid.
by dgermeys
Thu Jul 06, 2017 3:21 pm
Forum: Rose Hybridizers Association Forum
Topic: Magnifica (rubiginosa hybrid)
Replies: 3
Views: 545

Magnifica (rubiginosa hybrid)

I was wondering about this rubiginosa hybrid, rosa magnifica. HelpmeFind says it is pentaploid but there is no reference for that. Could it be that this rose is actually hexaploid? http://www.helpmefind.com/gardening/l.p ... 4064&tab=1