Search found 396 matches

by david zlesak
Fri Nov 28, 2014 10:38 am
Forum: Rose Hybridizers Association Forum
Topic: Persian Yellow
Replies: 68
Views: 9484

Re: Persian Yellow

Thank you for checking Karl! Sometimes things get perpetuated in the literature as people keep citing others and it is just good to reconfirm for a number of reasons. Maybe a rose sold under a name is not the same rose originally described or we try to do our best, but make an error. Hi Johannes! I'...
by david zlesak
Thu Nov 27, 2014 12:35 pm
Forum: Rose Hybridizers Association Forum
Topic: 'New Dawn' hybrids
Replies: 26
Views: 5870

Re: 'New Dawn' hybrids

Hi Don!

Pat Henry at Roses Unlimited sold it for a few years. Also Brentwood Bay had it for a bit. Maybe Pat still has some available if people want GC. It was named for a the daughter of a good friend, Dr. Jeff Gillman, who liked purple.
by david zlesak
Thu Nov 27, 2014 12:20 pm
Forum: Rose Hybridizers Association Forum
Topic: Persian Yellow
Replies: 68
Views: 9484

Re: Persian Yellow

Thanks for that reference Karl. I think I saw it and want to access it again. Maybe this double one sold as 'Persian Yellow' and their double yellow one(s) are different genotypes. I am interested in if they used cytology to document chromosome number or flow cytometry. Flow cytometry is indirect an...
by david zlesak
Mon Nov 24, 2014 11:16 am
Forum: Rose Hybridizers Association Forum
Topic: Persian Yellow
Replies: 68
Views: 9484

Re: Persian Yellow

Hi Larry!! Great question!! Looking through my pictures I wasn't able to find a good closeup of the pistils. The stigmas looked light colored and maybe there could be a bit of red on the style, but I couldn't tell for sure from the pictures. Something that happens once in a while on some of the plan...
by david zlesak
Mon Nov 24, 2014 11:07 am
Forum: Rose Hybridizers Association Forum
Topic: Need Help on the I.D. of this Buck Rose
Replies: 4
Views: 868

Re: Need Help on the I.D. of this Buck Rose

I agree it is difficult but 'Hawkeye Belle' resonates with me because of the foliage color and more rounded leaflets.
by david zlesak
Mon Nov 24, 2014 11:02 am
Forum: Rose Hybridizers Association Forum
Topic: 'New Dawn' hybrids
Replies: 26
Views: 5870

Re: 'New Dawn' hybrids

I love the color of the large single too. It does rebloom like 'Therese Bugnet'. 'Catherine Guelda' blooms more continuously more similarly to a polyantha.
by david zlesak
Sat Nov 22, 2014 7:19 pm
Forum: Rose Hybridizers Association Forum
Topic: Persian Yellow
Replies: 68
Views: 9484

Persian Yellow

I was wondering how many people have gone back to 'Persian Yellow' to try to get a more intense colored yellow flowers. Your hybrid Larry Carefree Copper is sure beautiful with the other key R. foetida selection 'Austrian Copper' with its warm undertones. There is a nice paper on crossing Persian Ye...
by david zlesak
Sat Nov 22, 2014 9:49 am
Forum: Rose Hybridizers Association Forum
Topic: 'New Dawn' hybrids
Replies: 26
Views: 5870

Re: 'New Dawn' hybrids

I love 'Therese Bugnet' and have used it to a limited extent over the years and really like some of its offspring. It crosses very easily with rugosas. Many of the offspring had the thick glossy rugosa foliage again and most others were intermediate. Many had flowers with 'Therese Bugnet' form. The ...
by david zlesak
Wed Nov 19, 2014 10:01 pm
Forum: Rose Hybridizers Association Forum
Topic: 'New Dawn' hybrids
Replies: 26
Views: 5870

Re: 'New Dawn' hybrids

I love 'Yvonne Rabier' and have had it in the garden for over a decade. It is marginally hardy for me, but very pretty and the flowers are large compared to my more hardy polyanthas. It is above average for health here and does get some infection with black spot and leaf spot. I think Ralph Moore us...
by david zlesak
Fri Nov 14, 2014 6:29 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature and PNRSV infected roses
Replies: 4
Views: 872

Re: temperature and PNRSV infected roses

I've been observing the same trend Larry. Something along the same line that troubles me is the pecking order of journals being primarily based on a number called impact factor (IF). The higher the IF, the more prestige and reward authors garner as well. IF is calculated by how many times relatively...
by david zlesak
Sun Nov 09, 2014 10:04 am
Forum: Rose Hybridizers Association Forum
Topic: Finally ready for winter
Replies: 8
Views: 1426

Finally ready for winter

In the Twin Cities we supposed to get a significant snow beginning later tonight. For the past few years now I've been using these construction blankets over my potted roses and it has been the easiest way to overwinter pots I've tried so far. Other friends do this and encouraged me to try. There ar...
by david zlesak
Sun Nov 09, 2014 9:53 am
Forum: Rose Hybridizers Association Forum
Topic: Post-Doctoral Research Associate, Entomology and Plant Patho
Replies: 1
Views: 425

Re: Post-Doctoral Research Associate, Entomology and Plant P

That is great things are already moving along for the RRD grant to hire researchers to conduct the work. There'll be grad students and other post docs too. This will be a great opportunity for more researchers to become familiar with roses and hopefully committed to more rose work in the future afte...
by david zlesak
Fri Nov 07, 2014 9:07 pm
Forum: Rose Hybridizers Association Forum
Topic: Chromosome Doubling Experiment
Replies: 38
Views: 9181

Re: Chromosome Doubling Experiment

Hi Warren!! That is great! Your last seedling pictured looks like a promising polyploid to me due to the wider secondary veins off of the midvein and more rounded leaflets.
by david zlesak
Mon Nov 03, 2014 11:30 pm
Forum: Rose Hybridizers Association Forum
Topic: R. setigera reading
Replies: 5
Views: 807

Re: R. setigera reading

Thank you for your kind words Julie :0). It was a wonderful research project and fun to write up our findings for the ARS Annual Elena was editing. I'll see what we need to do to get permission to reprint it and if we can forward it along to Betsy for consideration.
by david zlesak
Mon Sep 08, 2014 2:13 pm
Forum: Rose Hybridizers Association Forum
Topic: Rugosa seedlings
Replies: 14
Views: 1929

Re: Rugosa seedlings

[/attachment] 6 1 2010 My 4x rugosa IMG_7263 (27).jpg That is great you're making progress with that line Paul!! I haven't moved that line forward yet. I had a tree cut down near the original 4x plant and it is growing better this year again. Here are some pictures of it. It was started as an open p...
by david zlesak
Wed Aug 20, 2014 5:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Has anyone read this?
Replies: 11
Views: 1117

Re: Has anyone read this?

If I remember right, it basically points to winter hardiness likely being controlled by multiple genes each with so much of an effect and the trait being additively inherited. So crossing a tender and very hardy rose tends to give plants that are somewhat intermediate. Over generations one can accum...
by david zlesak
Wed Aug 20, 2014 9:45 am
Forum: Rose Hybridizers Association Forum
Topic: Canadian hardiness
Replies: 23
Views: 2122

Re: Canadian hardiness

Hi Rob! That is great you have that R. arkansana seedling. There were two open pollinated ones that I saved that seemed to be hybrids. I suspect the hybrid I shared years ago (was it about 2008?) may be the large single with darker stamens, is that right? Is your R. arkansana you used in your Cal Po...
by david zlesak
Tue Aug 19, 2014 9:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Canadian hardiness
Replies: 23
Views: 2122

Re: Canadian hardiness

I suspect part of the marketing for Morden roses being hardy to zone 3 could be that they survived there in Morden in zone 3. They seem to get more reliable snow cover than the Twin Cities area where I'm at in zone 4. Having the crowns blanketed in snow likely buffers them nicely from the zone 3 Mor...
by david zlesak
Tue Aug 19, 2014 12:05 pm
Forum: Rose Hybridizers Association Forum
Topic: Can anything be diserned by comparitive size of hip
Replies: 6
Views: 965

Re: Can anything be diserned by comparitive size of hip

Over a decade ago I compared seeds per hip between controlled and open pollinations for several roses I was using at the time as females. The open pollinations tended to have more seeds per hip and I suggest some possible reasons why. It was in the Winter 2002 RHA issue and the article is attached.