Search found 282 matches

by david zlesak
Fri Aug 10, 2018 11:36 am
Forum: Rose Hybridizers Association Forum
Topic: Nematode resistance
Replies: 3
Views: 95

Re: Nematode resistance

I haven't heard a lot about nematodes in roses in the North where I'm at and have the impression that Florida is particularly favorable to them and was the reason R. x fortuniana was used. Is that accurate? Do others throughout the South face nematode issues on roses? On a side note, from my underst...
by david zlesak
Fri Aug 03, 2018 7:30 pm
Forum: Rose Hybridizers Association Forum
Topic: Identification request
Replies: 7
Views: 192

Re: Identification request

Hmmm. It sure reminds me of the very hardy hybrid gallica 'Alika'.
by david zlesak
Thu Aug 02, 2018 8:47 pm
Forum: Rose Hybridizers Association Forum
Topic: Cercospora
Replies: 7
Views: 188

Re: Cercospora

I don't know of any roses in my garden that don't get any cercospora. Many rugosas seem relatively clean of it. I was in a non-sprayed garden today and Screaming Neon Red seems to have a lot less of it than a lot of other roses. I have some op seedlings of Rainbow Knock Out that seem to be relativel...
by david zlesak
Sun Jul 08, 2018 3:05 pm
Forum: Rose Hybridizers Association Forum
Topic: Star Roses won seven out of 11 most sustainable, hardy, pest-resistant
Replies: 10
Views: 317

Re: Star Roses won seven out of 11 most sustainable, hardy, pest-resistant

Hi Philip! I wish I have used it more over the years to say more. I've been transitioning gardens, etc. in recent years. I like the habit that R. setigera contributes for flower clusters. R. multiflora and R. wichurana based polys seem to have more elongated clusters of flowers that often lead to lo...
by david zlesak
Thu Jul 05, 2018 12:18 pm
Forum: Rose Hybridizers Association Forum
Topic: Star Roses won seven out of 11 most sustainable, hardy, pest-resistant
Replies: 10
Views: 317

Re: Star Roses won seven out of 11 most sustainable, hardy, pest-resistant

Hi Stephen, Yes... I can try to take some cuttings this summer to share with folks that would like it. I should be more proactive seeing if other nurseries would like to pick it up. I think since it and Candy Oh! are small flowered singles and not necessarily what people think of as typical roses, t...
by david zlesak
Wed Jul 04, 2018 2:16 pm
Forum: Rose Hybridizers Association Forum
Topic: Star Roses won seven out of 11 most sustainable, hardy, pest-resistant
Replies: 10
Views: 317

Re: Star Roses won seven out of 11 most sustainable, hardy, pest-resistant

Thank you Philip!! Thank you Philip! I'm excited for A.R.T.S. becoming a stronger voice for scientific regional rose testing in the US with it going into its second year of awards being announced. Oso Happy Petit Pink is how Spring Meadow Nursery first introduced it. They also had the two other smal...
by david zlesak
Sun Jul 01, 2018 11:11 am
Forum: Rose Hybridizers Association Forum
Topic: yellow rugosas
Replies: 12
Views: 359

Re: yellow rugosas

That's a great idea Warren! Hopefully the cuttings root well and there'll be a number to share. Thank you Kim!! I'll reach out to Burling too. It'll be great to have a number of plants of 'Golden Angel' to cross a lot of diploid males onto.
by david zlesak
Thu Jun 28, 2018 10:04 pm
Forum: Rose Hybridizers Association Forum
Topic: yellow rugosas
Replies: 12
Views: 359

Re: yellow rugosas

I have a seedling from many years back of 'Pristine Pavement' x R. primula. Strangely it seldom flowers even though it is hardy. The foliage is beautiful and healthy. It didn't seem fertile when I looked at its pollen. It didn't set hips either. I have to suddenly move/destroy a rose garden at a fri...
by david zlesak
Tue Jun 12, 2018 11:05 am
Forum: Rose Hybridizers Association Forum
Topic: counting the ploidy level...
Replies: 7
Views: 365

Re: counting the ploidy level...

Here is the final page.
by david zlesak
Tue Jun 12, 2018 11:04 am
Forum: Rose Hybridizers Association Forum
Topic: counting the ploidy level...
Replies: 7
Views: 365

Re: counting the ploidy level...

This is what I have been using and it works well for me. It is much simpler and takes less chemicals. We don't typically get as darkly stained chromosomes, but it works well. The key is getting roots that are actively dividing with some cells in metaphase. If we don't have that no amount of chemical...
by david zlesak
Sun Jun 03, 2018 11:13 pm
Forum: Rose Hybridizers Association Forum
Topic: Spring Observations
Replies: 9
Views: 475

Re: Spring Observations

'Datota's Song' was bred by my colleague's father, Robert Smith. Robert had a greenhouse/garden center and sold produce and really loved breeding roses. He was in Mitchell, South Dakota. His son, Brian, was inspired to breed plants. Brian was my college advisor 25+ years ago and is now my colleague ...
by david zlesak
Thu May 24, 2018 11:00 pm
Forum: Rose Hybridizers Association Forum
Topic: R. gallica versus R. rubiginosa
Replies: 2
Views: 250

Re: R. gallica versus R. rubiginosa

That's a great question. Supposedly R. rubiginosa is a very complex polyploid with multiple progenitor species and maybe R. gallica is one of them.
by david zlesak
Wed May 09, 2018 12:32 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 735

Re: Canina Chromosome pairing

I love Caninae section species. When I started breeding roses in the 1980's I was in awe of the fragrant foliage of R. eglanteria. I tried it as a parent with modern roses and the only direction crosses would take is with it as a female. Many of the supposed hybrids looked like the mom, but that is ...
by david zlesak
Sat Apr 21, 2018 10:18 pm
Forum: Rose Hybridizers Association Forum
Topic: new-hardy-rose-variety-was-16-years-making
Replies: 10
Views: 687

Re: new-hardy-rose-variety-was-16-years-making

Congratulations Julie!!! I LOVE your Cherry FrostTM rose. It has been hardy in the Twin Cities with minimal dieback, very healthy, and it always has at least some flowers on it through the growing season. The color is a clear red that stays strong and true from beginning to end.
by david zlesak
Sun Apr 15, 2018 7:39 pm
Forum: Rose Hybridizers Association Forum
Topic: downy mildew research
Replies: 2
Views: 320

Re: downy mildew research

It would be wonderful to have roses with good resistance to downy mildew. Dr. Pascal Heitzler is doing some great work with Rosa arvensis. It supposed to have resistance and some good shade tolerance. I tried to find a source for the species in the US, but haven't been successful yet. It would hopef...
by david zlesak
Sun Apr 08, 2018 12:26 pm
Forum: Rose Hybridizers Association Forum
Topic: patent law confusion
Replies: 4
Views: 381

Re: patent law confusion

From my understanding, the 20 year timeframe for a patent to be active is from the application date, even though the time the patent is issued can be a year or two after application. Roses seem to be pretty streamlined with issue dates about a year after application, but when I submitted patent appl...
by david zlesak
Mon Apr 02, 2018 10:00 pm
Forum: Rose Hybridizers Association Forum
Topic: Rosa maximowicziana seeds
Replies: 18
Views: 2671

Re: Rosa maximowicziana seeds

Hi Jukka!! That is a great idea!! I love 'Therese Bugnet'. I just moved a little over a year ago and am establishing rose beds and have a 'Therese Bugnet' in a pot right now I haven't gotten in the ground yet that hopefully will mature nicely in the next year or two. I love the poly hybrids with TB ...
by david zlesak
Sun Apr 01, 2018 9:54 am
Forum: Rose Hybridizers Association Forum
Topic: Resistance to rose rosette virus
Replies: 6
Views: 1411

Re: Resistance to rose rosette virus

Hi Henry, It sounds like Dr. Byrne and his student that generated crosses with it have given up using it as a parent and determined Stormy Weather was likely just an escape is Patrick's grafting exercise. It sounds like infected plants were found in either the RRD field trials being done with collab...
by david zlesak
Sun Apr 01, 2018 9:48 am
Forum: Rose Hybridizers Association Forum
Topic: Rosa maximowicziana seeds
Replies: 18
Views: 2671

Re: Rosa maximowicziana seeds

Thank you Jukka!! That is great to know. How is the health by you? It is average to a bit above average here defoliating some by fall. The leaves on the one I have has a little bit of gloss to them, which is nice. I hope you get some germinations. I love the one time blooming ramblers from it of a p...
by david zlesak
Fri Mar 30, 2018 9:02 am
Forum: Rose Hybridizers Association Forum
Topic: Diploid x Higherploid or Higherploid x Diploid
Replies: 34
Views: 2369

Re: Diploid x Higherploid or Higherploid x Diploid

That's a great question. I don't know... I suspect it may be related to the genetic background and how precocious certain parents are with outcrossing and what they are being mated with. Tetraploid Moore mini roses that are very fertile ('Splish Splash', 'Rise 'N Shine', etc.) cross pretty well with...