Search found 288 matches

by pierre
Wed Feb 17, 2016 12:02 am
Forum: Rose Hybridizers Association Forum
Topic: So I don't think I'll be using Coir again
Replies: 6
Views: 1215

Re: So I don't think I'll be using Coir again

First use an horticultural grade coir and rinse it. Second add nitrogen (alfalfa meal is excellent) mixing well. Third inoculate with bacterias and a month later with Trichoderma micorrhyzes (choice is viride). Florist roses were grown in very large scale operations in pure coir and monitored solubl...
by pierre
Tue Feb 16, 2016 11:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Proliferation of first blossom
Replies: 9
Views: 1356

Re: Proliferation of first blossom

Yes Simon this expression is environment dependent. Tens of years ago there were a big rose breeder that released a florist rose with this fault as it was divine when without green center. Alas the worm was in the fruit and he had to compensate when his customers found they had greenhouses full of u...
by pierre
Mon Feb 15, 2016 11:53 pm
Forum: Rose Hybridizers Association Forum
Topic: Proliferation of first blossom
Replies: 9
Views: 1356

Re: Proliferation of first blossom

Hi Joe Same observation as the others and a plus: proliferation at times has a virus component/cause. That is some virus (do not ask me which) have the hability to distort flower parts causing proliferation, shortened petals and oversized foliaceous sepals. All this "clinical picture is graft and bi...
by pierre
Sun Dec 27, 2015 2:22 am
Forum: Rose Hybridizers Association Forum
Topic: The Effect of Rose Root Size on Drought Stress Tolerance and
Replies: 6
Views: 1492

Re: The Effect of Rose Root Size on Drought Stress Tolerance

David May we have a look at the tab that shows leaf and other features ratings? Here the question is which came first, the chicken or the egg. That is do the leaf generate the roots growth or reversely. No doubt strong leaf coverage by itself induce more roots. No doubt either that strong roots do n...
by pierre
Fri Dec 04, 2015 2:43 am
Forum: Rose Hybridizers Association Forum
Topic: Ideas for roses questions to answer through DNA fingerprinting
Replies: 66
Views: 5501

Re: Ideas for roses questions to answer through DNA fingerpr

Here is a question to answer through DNA analysis: from which species garden roses cytoplasm went from?
by pierre
Fri Dec 04, 2015 2:38 am
Forum: Rose Hybridizers Association Forum
Topic: Ideas for roses questions to answer through DNA fingerprinting
Replies: 66
Views: 5501

Re: Ideas for roses questions to answer through DNA fingerpr

Your comments are sound Christopher and highlight how HMF percent ancestry feature is unreliable. Don's chart is very interesting as it evidence how much roses pedigrees are convergent. This convergence is illustration of an all breeders constant breeding strategy over centuries. The strategy being ...
by pierre
Wed Nov 25, 2015 12:47 am
Forum: Rose Hybridizers Association Forum
Topic: Last posting
Replies: 10
Views: 1710

Re: Last posting

Why Warren?
by pierre
Sun Oct 04, 2015 11:06 pm
Forum: Rose Hybridizers Association Forum
Topic: What to expect with Baby Love OP F1
Replies: 13
Views: 1285

Re: What to expect with Baby Love OP F1

Sorry there is a dark side.

BL resistance to BS has a breach. That in a year or two in a BS favorable environment makes it as defoliated and dwindling as any modern rose.

Apparently unnoticed where BS is not a problem.
by pierre
Thu Sep 24, 2015 11:50 pm
Forum: Rose Hybridizers Association Forum
Topic: research - crossibility in roses
Replies: 5
Views: 718

Re: research - crossibility in roses

That mother var and maturing temperatures determine germinating hability I consider as facts experience confirmed.
by pierre
Thu Sep 24, 2015 11:32 pm
Forum: Rose Hybridizers Association Forum
Topic: 2015 germination
Replies: 12
Views: 1145

Re: 2015 germination

Welcome Marc. Since september 15 to yesterday I was rounding ... in Italy. Without a PC or smartphone... As much sending plants from Italy could be difficult as much the reverse is easy. US controls of imported plants is not for every postage and you can try your luck sending stick with a few eyes a...
by pierre
Wed Sep 09, 2015 11:28 pm
Forum: Rose Hybridizers Association Forum
Topic: Resistance: In my garden it's more than about black spot....
Replies: 29
Views: 3573

Re: Resistance: In my garden it's more than about black spot

Let me insist: there are every year a few roses introduced with four stars for BS resistance Kordes rating you can rely on: they are practically immune. If every leaf may not all last spring to autumn, the plant is all along well clad with healthy leaves. As soon as in America consider i.e. Floribun...
by pierre
Wed Sep 09, 2015 12:03 am
Forum: Rose Hybridizers Association Forum
Topic: Resistance: In my garden it's more than about black spot....
Replies: 29
Views: 3573

Re: Resistance: In my garden it's more than about black spot

Many Radler's or Lim roses are not available here so I cannot comment. Same as you for older bred Westerland, Rugelda and not top Carmela Fairy Tale. For these Kordes rating is 3 stars for BS and PM. A bit more than deserved. Later bred are more and more reliably rated even if some may be down grade...
by pierre
Tue Sep 08, 2015 1:06 am
Forum: Rose Hybridizers Association Forum
Topic: Passing resistence to the next generation
Replies: 11
Views: 1185

Re: Passing resistence to the next generation

Apologies to Henry and all. This paper is outstanding as real key words could be: ...Our study demonstrates that disease resistance can be carried forward to the next generation from plants exposed to fitness-reducing disease pressure. It indicates an epigenetic mechanism of disease protection, whic...
by pierre
Tue Sep 08, 2015 12:59 am
Forum: Rose Hybridizers Association Forum
Topic: First hips harvested in 6 years
Replies: 25
Views: 2585

Re: First hips harvested in 6 years

In my humble opinion if there are resistances in some old roses such as Teas and Chinas, desease evolution occurred and superseded most modern roses defenses at least in the less favored environments. And there is a widespread less favorable one that is large plantings of a single clone. It is not f...
by pierre
Mon Sep 07, 2015 11:33 pm
Forum: Rose Hybridizers Association Forum
Topic: Passing resistence to the next generation
Replies: 11
Views: 1185

Re: Passing resistence to the next generation

Very interesting but Key words are: ....Whether priming can be inherited epigenetically from disease-exposed Arabidopsis remains unknown, even though it can be expected that transgenerational defense priming would provide benefits for short-generation plant species with limited ability to outlive di...
by pierre
Mon Sep 07, 2015 11:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Resistance: In my garden it's more than about black spot....
Replies: 29
Views: 3573

Re: Resistance: In my garden it's more than about black spot

To have funghal deseases is no guarantee that you have all strains. You can believe to some rose resistance for years until it meets the virulent for it strain. At my field's semi tropical environment, french Riviera, spot deseases resistance breakdown is common place i.e. Pretty Lady was immune for...
by pierre
Fri Jul 31, 2015 10:51 pm
Forum: Rose Hybridizers Association Forum
Topic: veilchenblau ploidy?
Replies: 16
Views: 1132

Re: veilchenblau ploidy?

"raise OP seeds of 'Crimson Rambler'"

May be I will but Crimson Rambler sets few OP hips.
by pierre
Tue Jul 28, 2015 8:39 am
Forum: Rose Hybridizers Association Forum
Topic: F3 Hybrid Rosa Virginiana Seedlings
Replies: 74
Views: 7762

Re: F3 Hybrid Rosa Virginiana Seedlings

Choice of words is difficult. I probably did not understand well. The backcross I speak of is to garden hybrids. Away from named species whose genes are diluted more and more. This do not lower these plant appeal only species content. After how many generations of crossing away from species is the r...
by pierre
Tue Jul 28, 2015 8:24 am
Forum: Rose Hybridizers Association Forum
Topic: An outstanding one
Replies: 2
Views: 608

An outstanding one

Two years ago I stumbled on this one that is in Bierkreek listing. The numerous fruits were not expectable from this cross nor the smooth petals so I asked for one to Hans van Hage. Very nice flowers: HMF pictures are representative. Average spination that is low for a Schneezwerg sdg. It is a very ...
by pierre
Tue Jul 28, 2015 12:40 am
Forum: Rose Hybridizers Association Forum
Topic: regarding the use of species
Replies: 29
Views: 2685

Re: regarding the use of species

Joe wrote: "Personally I would be happy if my crosses using R. carolina as a seed parent showed a heavier influence from R. carolina...what's not to like about those characteristics? Just get rid of the suckering and add remontancy and you'd have a spectacular garden rose." Here is an idea I like a ...