Search found 274 matches

by david zlesak
Tue Jun 12, 2018 11:05 am
Forum: Rose Hybridizers Association Forum
Topic: counting the ploidy level...
Replies: 7
Views: 176

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: 176

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: 268

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: 138

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: 538

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: 574

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: 272

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: 322

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: 2456

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: 1335

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: 2456

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: 2099

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...
by david zlesak
Sat Mar 24, 2018 1:00 pm
Forum: Rose Hybridizers Association Forum
Topic: National Roses Clean Plant Meeting
Replies: 14
Views: 2394

Re: National Roses Clean Plant Meeting

This is wonderful news!!! The U of Maryland money, from my understanding, is to help house a virus positive collection and generate a source for material positive for various rose viruses for plant diagnostics labs to have as positive controls to make sure PCR and/or ELISA tests are effectively dete...
by david zlesak
Sun Mar 18, 2018 1:40 pm
Forum: Rose Hybridizers Association Forum
Topic: Genome engineering in ornamental plants: Current status and
Replies: 5
Views: 315

Re: Genome engineering in ornamental plants: Current status

I wonder what the limitations are with CRISPR technology. From what I could tell from a friend at the U of MN, people can use it freely for research, however, if there is a commercial application/product one has to work with the patent holders to be able to commercialize things. My friend suggested ...
by david zlesak
Thu Mar 15, 2018 9:32 am
Forum: Rose Hybridizers Association Forum
Topic: Breeding plans for 2018
Replies: 30
Views: 2079

Re: Breeding plans for 2018

Hi Martin!!

I'm very glad you are going to breed roses again! I love your Pink Gnome. If it is of interest, Mango Salsa and Coral Drift are diploids and Peachy Knock Out is a triploid.
by david zlesak
Tue Mar 13, 2018 2:02 pm
Forum: Rose Hybridizers Association Forum
Topic: polyploidization. with potatoes
Replies: 2
Views: 257

Re: polyploidization. with potatoes

Hi Henry!! This is a wonderful procedure!! Thank you for sharing it!! I love it. I've doubled some lilacs and another species in the past with a similar method in culture, but I love the liquid overlay and the axillary buds just above the media to be exposed in the liquid containing the chemical. It...
by david zlesak
Tue Mar 13, 2018 1:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose program at the U.S. National Arboretum
Replies: 3
Views: 356

Re: Rose program at the U.S. National Arboretum

I had the pleasure of hearing Dr. Windham speak a few times this past year on his RRD research. Most recently I heard him speak at the Tenarky District Rose Society meeting in Bowling Green, KY. I especially enjoyed learning about what a grad student of his and him are working on in regard to trying...
by david zlesak
Wed Mar 07, 2018 10:06 am
Forum: Rose Hybridizers Association Forum
Topic: Source for Jens Munk
Replies: 3
Views: 316

Re: Source for Jens Munk

I would encourage your friend to check Home Depot in the summer. The past few years in the Twin Cities at least there have been pallets of potted Ag Canada roses produced by Pan American Nursery at many of the Home Depots. They had a very wide selection of Ag Canada roses including 'Jens Munk'.
by david zlesak
Sun Mar 04, 2018 5:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Darlow's enigma
Replies: 4
Views: 423

Re: Darlow's enigma

That's a great question Matt. I'm not sure exactly, but compared to the more multiflora-based polys I have lots of and enjoy, it seems like 'Darlow's Enigma' has something else besides R. multiflora in it too. I have no proof, but I wonder if it is a seedling of 'Nastarana' or somehow related to it....
by david zlesak
Wed Feb 28, 2018 10:26 am
Forum: Rose Hybridizers Association Forum
Topic: Twins!!
Replies: 2
Views: 408

Twins!!

It is really fun to find twin rose seedlings. When there are two that share the same outer coating (testa) and there is a larger and a smaller one, the smaller one is usually haploid I've found (having half as many chromosomes as the mother plant). Before fertilization, within the female tissue ther...