Search found 995 matches

by Peter Harris
Thu Dec 06, 2018 10:34 pm
Forum: Rose Hybridizers Association Forum
Topic: Rooting Cuttings from Seedlings
Replies: 8
Views: 100

Re: Rooting Cuttings from Seedlings

Jonathan,
I've sent the article by email,
Peter
by Peter Harris
Thu Dec 06, 2018 3:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Rooting Cuttings from Seedlings
Replies: 8
Views: 100

Re: Rooting Cuttings from Seedlings

I had a similar problem (root dying) and was able to save most seedlings. I wrote about this experience in "Radical Radicle Surgery" on page 15 of the Spring 1980 RHA Newsletter. My problem was gibberellic acid toxicity, not damping off. By removing the dying portion of the stem and some part above ...
by Peter Harris
Tue May 01, 2018 9:42 am
Forum: Rose Hybridizers Association Forum
Topic: The Rosa genome and insights into domestication of modern roses
Replies: 12
Views: 708

The Rosa genome and insights into domestication of modern roses

The April 30, 2018 issue of [i]Nature Ge­­­netics[/i] contains a study which concludes (this is a very simple summary that I hope is accurate) that scent, recurrent blooming, and color are controlled by some genes that work in opposition to each other, and that breeders' emphases on color and recurr...
by Peter Harris
Mon Apr 30, 2018 12:00 pm
Forum: Rose Hybridizers Association Forum
Topic: What about laevigata?
Replies: 33
Views: 1885

Re: What about laevigata?

[quote="Karl K" post_id=67757 time=1525094674 user_id=1292] Somewhere I read a note about R. laevigata hips being consumed by livestock (of some kind) and the seeds sprouting where they fell. I have tried to find it, but so far no luck. [/quote] Karl, the reason you've not had luck with that search ...
by Peter Harris
Sun Apr 22, 2018 10:55 pm
Forum: Rose Hybridizers Association Forum
Topic: Assessment of genetic diversity in 29 Rose germplasms using SCoT marker
Replies: 5
Views: 371

Re: Assessment of genetic diversity in 29 Rose germplasms using SCoT marker

Henry, What did you learn from reading the paper? Maybe I missed something meaningful. Perhaps you can explain it better than the authors did. As I see it, the problems with the paper have much to do with unclear plan and poor writing, nothing to do with new techniques/applications. Elsevier is simp...
by Peter Harris
Sun Apr 22, 2018 3:54 pm
Forum: Rose Hybridizers Association Forum
Topic: Assessment of genetic diversity in 29 Rose germplasms using SCoT marker
Replies: 5
Views: 371

Re: Assessment of genetic diversity in 29 Rose germplasms using SCoT marker

I have read the article in question. It is incoherent, without plan, or nearly so, and generally not worth the time one might spend in reading it. It reaches no meaningful conclusions. Apparently it will go on the co-authors' resumes as if it were of scientific value.

Peter
by Peter Harris
Fri Apr 20, 2018 11:02 pm
Forum: Rose Hybridizers Association Forum
Topic: NewFlora site down for over a month
Replies: 5
Views: 1005

Re: NewFlora site down for over a month

Don, The only 2 roses I know of from NovaFlora are 1. [b]Popcorn Drift[/b], a radiation-induced sport of Peach Drift. http://www.helpmefind.com/rose/l.php?l=2.67517.0 In the Monaco Rose Trials, it won the Silver Medal -- Groundcover (June 4, 2016) 2. [b]Bubble Double[/b], a radiation-induced sport o...
by Peter Harris
Sun Apr 15, 2018 5:52 pm
Forum: Rose Hybridizers Association Forum
Topic: High Country wishlist
Replies: 13
Views: 854

Re: High Country wishlist

Agnes pollen has some viability. I discovered this in some crosses about 30 years ago. But I never got anything useful from the few seeds I got. See http://www.helpmefind.com/gardening/l.php?l=2.26244

Peter
by Peter Harris
Mon Apr 02, 2018 7:33 pm
Forum: Rose Hybridizers Association Forum
Topic: reblooming botanical roses
Replies: 16
Views: 1542

Re: reblooming botanical roses

The Spring 2012 [i]Rose Hybridizers Newsletter[/i] (Vol. XLIII, No. 1, pp. 17-19) has a discussion of recurrent blooming in the article entitled "Remontancy: Genetics, Species, Recommended Parents." The article was a "From the Forum" offering, including comments made by many in their posts on the fo...
by Peter Harris
Sun Feb 11, 2018 5:30 pm
Forum: Rose Hybridizers Association Forum
Topic: Those Valentine's Day roses
Replies: 4
Views: 511

Those Valentine's Day roses

Ever wonder what happened to the production of roses as cut flowers in the U.S.A.?

https://www.washingtonpost.com/news/bus ... tines-day/
by Peter Harris
Thu Nov 02, 2017 11:34 am
Forum: Rose Hybridizers Association Forum
Topic: what a species is, or isn't
Replies: 24
Views: 3296

what a species is, or isn't

When I began spreading pollen on roses in 1972, I didn't even think about rose species. But gradually I learned about [i]R. spinosissima[/i] and other species. And I learned (incorrectly) that species are unchangeable things. But since that concept did not account for obvious differences in how they...
by Peter Harris
Mon Oct 30, 2017 12:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Hip ripeness revisited.
Replies: 17
Views: 1518

Re: Hip ripeness revisited.

Tony, Go ahead and harvest it now. Hips of most modern roses will have viable seeds after approximately 3 months. I've had a few viable seeds in 2-month hips. If the rose does not get a lot of sunshine, a longer period may be needed, but usually 3 months is adequate. Germination seems to be better i...
by Peter Harris
Sat Jul 01, 2017 12:54 pm
Forum: Rose Hybridizers Association Forum
Topic: Klima
Replies: 9
Views: 1535

Re: Klima

I've never heard of this rose. Where did you get it?

Peter
by Peter Harris
Wed Jun 28, 2017 9:51 pm
Forum: Rose Hybridizers Association Forum
Topic: NewFlora site down for over a month
Replies: 5
Views: 1005

Re: NewFlora site down for over a month

Philip, on March 31, NewFlora was acquired by Ball Horticultural--which also owns Conard-Pyle/Star Roses and Plants.

Peter
by Peter Harris
Tue Apr 25, 2017 11:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Rooting response under LED systems in Rosa canina in vitro c
Replies: 2
Views: 517

Re: Rooting response under LED systems in Rosa canina in vit

Actually, the link does work. But if you have Adblocker turned on, you'll need to turn it off to see the abstract for the article.

Peter
by Peter Harris
Tue Apr 25, 2017 11:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Rooting response under LED systems in Rosa canina in vitro c
Replies: 2
Views: 517

Re: Rooting response under LED systems in Rosa canina in vit

Henry, that link doesn't work for me. Gets me to a page with some arrows.

Peter
by Peter Harris
Fri Jan 13, 2017 10:40 pm
Forum: Rose Hybridizers Association Forum
Topic: can anyone help identify this rose?
Replies: 15
Views: 2987

Re: can anyone help identify this rose?

According to Chuckp, the rose was found in Barbados.

Let the identification begin.

Peter
by Peter Harris
Thu Jan 12, 2017 5:52 am
Forum: Rose Hybridizers Association Forum
Topic: can anyone help identify this rose?
Replies: 15
Views: 2987

Re: can anyone help identify this rose?

[quote="chuckp"]Hi, Just found this rose in my travels. I think according to HMF this rose maybe "Seven Sisters " Chuckp https://www.helpmefind.com/rose/l.php?l=2.5699.1[/quote] It would help if you'd say where you were traveling when you found this rose--which, incidentally, does not look like 'Sev...
by Peter Harris
Thu Dec 01, 2016 7:57 am
Forum: Rose Hybridizers Association Forum
Topic: Propiconazole
Replies: 4
Views: 976

Re: Propiconazole

Protecting roses against leaf diseases is the normal use of propiconazole. I'd agree that it's not a good idea to spray propiconazole (under any brand name) inside the house. If you've been doing that, stop it. Here is a brief article detailing some results of toxicity studies of propiconazole: http...
by Peter Harris
Sat Nov 26, 2016 1:04 am
Forum: Rose Hybridizers Association Forum
Topic: R. rugosa Alba x Dr Harry Upshall
Replies: 18
Views: 2942

Re: R. rugosa Alba x Dr Harry Upshall

Johannes,

I'm pretty sure Andre has White Mountains, not Mont Blanc.

http://www.helpmefind.com/gardening/l.php?l=2.6539