Search found 310 matches

by david zlesak
Thu Jan 17, 2019 10:56 pm
Forum: Rose Hybridizers Association Forum
Topic: Morden Series for health
Replies: 16
Views: 166

Re: Morden Series for health

I haven't seen rust on Ark-OP, but we don't typically have too much rust here. This one seems to be a hybrid with something neighboring (likely one of the Carefree BeautyTM seedlings growing nearby). It is an op of a stippled Rosa arkansana I dug up along the highway in Morris, MN.
by david zlesak
Mon Jan 14, 2019 10:23 am
Forum: Rose Hybridizers Association Forum
Topic: Rosa arvensis plena
Replies: 1
Views: 56

Rosa arvensis plena

Has anyone tried Rosa arvensis plena? http://www.helpmefind.com/gardening/l.php?l=2.5261&tab=1 Does it set hips? I love that R. arvenesis is reported to have shade tolerance (grows in forest understories) and downy mildew resistance. I've been having more trouble with downy mildew recently. It was r...
by david zlesak
Tue Jan 01, 2019 1:53 pm
Forum: Rose Hybridizers Association Forum
Topic: Do more richly colored seedlings have more richly colored blooms?
Replies: 10
Views: 275

Do more richly colored seedlings have more richly colored blooms?

Over the years I assumed the seedlings with more reddish color early on would make darker colored flowers. I haven't followed any through to see if that truly is the case or not. Have others tested this? I potted up some reddish and more soft yellow seedlings separately from the same family and hope...
by david zlesak
Sat Dec 29, 2018 11:00 am
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 675

Re: Rebloom

It sounds wonderful Kim! Hmmm. I studied Easter lilies for my doctorate and aspects of flowering was a part of my thesis. Temperatures below 70F can be perceived as chilling to Easter lilies, even though if the temperatures are below 50F the chilling hours (high 30's best) can speed along the chilli...
by david zlesak
Fri Dec 28, 2018 9:48 pm
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 675

Re: Rebloom

Hi Kim! That's fascinating!! I wonder what environmental cues are allowing for the reliable rebloom. What an amazing climate you live in!
by david zlesak
Fri Dec 28, 2018 11:47 am
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 675

Re: Rebloom

Here is a link to a pdf from a talk Fabrice and his group put together on this work. https://colloque.inra.fr/rgc8/content/d ... oucher.pdf
by david zlesak
Thu Dec 27, 2018 9:03 am
Forum: Rose Hybridizers Association Forum
Topic: THE ADAPTIVE POTENTIAL OF WILD ROSES AND THEIR PROSPECTS FOR ENRICHMENT OF DEGRADED AREAS
Replies: 1
Views: 44

Re: THE ADAPTIVE POTENTIAL OF WILD ROSES AND THEIR PROSPECTS FOR ENRICHMENT OF DEGRADED AREAS

Here's another article that is a little bit similar in describing situations where roses have been used to monitor/improve the environment. http://www.globalsciencebooks.info/Onli ... 2-165o.pdf
by david zlesak
Wed Dec 26, 2018 6:08 pm
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 675

Re: Rebloom

Dr. Fabrice Foucher and his team have done a lot of great work understanding flowering in roses and also associated species like strawberries. Here is a link to one of their papers https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-313X.2011.04776.x There is a key general gene found in many plan...
by david zlesak
Mon Dec 24, 2018 2:09 pm
Forum: Rose Hybridizers Association Forum
Topic: Found two sets of twins yesterday
Replies: 3
Views: 126

Found two sets of twins yesterday

Yesterday I was potting up some early germinating polyanthas and am excited there were two sets of twins that shared the same testa (seed coat). Most of the time the smaller twin has half as many chromosomes as the main seedling and has the same genetic constitution as the originating unfertilized e...
by david zlesak
Wed Dec 19, 2018 10:14 am
Forum: Rose Hybridizers Association Forum
Topic: Flower bud differentation and growing in rosehip.
Replies: 12
Views: 289

Re: Flower bud differentation and growing in rosehip.

There is the nice paper by Dr. Andy Roberts and others from 1999 where they looked at the role of gibberellins on flowering in some roses. It seemed like that from their experiments that flower initiation in the roses they were working with occurred in very early spring as the roses were waking up a...
by david zlesak
Sat Dec 15, 2018 11:46 am
Forum: Rose Hybridizers Association Forum
Topic: PowerPoints from NCPN-Roses meetings from last summer are posted
Replies: 4
Views: 246

Re: PowerPoints from NCPN-Roses meetings from last summer are posted

Hi Henry, at the meeting the presentations helped to update the group on the progress being made in various projects and efforts related to roses and clean stock. There was discussion along the way after each talk with a short time for Q&A and then plenty of time over meals and breaks for people to ...
by david zlesak
Wed Dec 12, 2018 3:08 pm
Forum: Rose Hybridizers Association Forum
Topic: PowerPoints from NCPN-Roses meetings from last summer are posted
Replies: 4
Views: 246

PowerPoints from NCPN-Roses meetings from last summer are posted

Hi Everyone!! The PowerPoint presentations from last summers National Clean Plant Network-Roses meetings are now posted. Hopefully the pictures and outlines with bullet points of the talks will provide a pretty good idea of of the messages conveyed. The RRD material I think is especially valuable fo...
by david zlesak
Mon Dec 10, 2018 8:08 pm
Forum: Rose Hybridizers Association Forum
Topic: Polstjarnan (expanded)
Replies: 14
Views: 2661

Re: Polstjarnan (expanded)

Thank you Margit for asking. I'm excited for them to bloom next year. I was hoping there'd be a little blooming this past spring, but they must have been too small. They overwintered perfectly for our relatively harsh winter, which was promising. Most all of them had a lot of leaf spot or black spot...
by david zlesak
Fri Nov 23, 2018 12:20 am
Forum: Rose Hybridizers Association Forum
Topic: Rising-Star-Honoree-David-Zlesak
Replies: 20
Views: 563

Re: Rising-Star-Honoree-David-Zlesak

That's a good question Don. We have characterized 13 different races, but there probably are a lot more. What makes a race is that the isolates comprising the race share a common set of virulence genes that can overcome the same host resistance genes. Of these 13 races, every rose we innoculated wit...
by david zlesak
Mon Nov 19, 2018 7:01 pm
Forum: Rose Hybridizers Association Forum
Topic: Rising-Star-Honoree-David-Zlesak
Replies: 20
Views: 563

Re: Rising-Star-Honoree-David-Zlesak

Thank you!! I just slipped in under the age limit. The friend that nominated me I learned did so when I was still 45 :0).
by david zlesak
Sat Nov 17, 2018 11:13 am
Forum: Rose Hybridizers Association Forum
Topic: Consistent early germination from a parent and the germination method I've been using
Replies: 1
Views: 215

Consistent early germination from a parent and the germination method I've been using

This past week I moved baggies of rose seed to the refrigerator that were at room temperature the past month or so and it is fun to see some germinating. Over the years it has been the same parent that is the precocious germinator and my indicator that I better get the rest of the seed in the fridge...
by david zlesak
Sat Nov 17, 2018 10:51 am
Forum: Rose Hybridizers Association Forum
Topic: Mapping a Novel Black Spot Resistance Locus in the Climbing Rose Brite EyesTM (‘RADbrite’)
Replies: 15
Views: 456

Re: Mapping a Novel Black Spot Resistance Locus in the Climbing Rose Brite EyesTM (‘RADbrite’)

It is amazing the bloom color diversity possible through Brite EyesTM. The degree of color change in your phototropic seedling is amazing Stephen.
by david zlesak
Wed Nov 14, 2018 8:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Mapping a Novel Black Spot Resistance Locus in the Climbing Rose Brite EyesTM (‘RADbrite’)
Replies: 15
Views: 456

Re: Mapping a Novel Black Spot Resistance Locus in the Climbing Rose Brite EyesTM (‘RADbrite’)

Thank you Don for the update. From the patent the male parent is listed as Abraham DarbyTM for Brite EyesTM. Hmmm, so maybe this resistance gene that we characterized on chromosome 5 could actually be from a rugosa.
by david zlesak
Tue Nov 13, 2018 6:39 pm
Forum: Rose Hybridizers Association Forum
Topic: Mapping a Novel Black Spot Resistance Locus in the Climbing Rose Brite EyesTM (‘RADbrite’)
Replies: 15
Views: 456

Re: Mapping a Novel Black Spot Resistance Locus in the Climbing Rose Brite EyesTM (‘RADbrite’)

We are excited this paper was accepted and will be in print soon. Brite EyesTM has a unique black spot resistance gene in it. Brite Eyes is tetraploid and has one copy of the allele for this gene that confers resistance and transmits it to 50% of its babies. There is one black spot race of the ~13 r...
by david zlesak
Sun Oct 07, 2018 12:47 pm
Forum: Rose Hybridizers Association Forum
Topic: Germination rate of Carefree Beauty OP?
Replies: 3
Views: 347

Re: Germination rate of Carefree Beauty OP?

For Carefree BeautyTM ('BUCbi') op seedlings in a past germination experiment I got from the 30's to 60's for percent germination. It is a relatively easy parent to germinate seeds from in my experience. http://hortsci.ashspublications.org/con ... 1.full.pdf