Search found 335 matches

by david zlesak
Tue Apr 16, 2019 9:19 pm
Forum: Rose Hybridizers Association Forum
Topic: Andrew Barocco - Texas hybridizer
Replies: 3
Views: 137

Re: Andrew Barocco - Texas hybridizer

Andrew gave a great tour of the breeding program for the NCPN-R meetings there at the Antique Rose Emporium that he leads with owner Michael Shoup.
by david zlesak
Thu Apr 11, 2019 11:53 pm
Forum: Rose Hybridizers Association Forum
Topic: Flowering, Drought and Disease Tolerance, and Landscape Performance of Landscape Roses Grown under Low-input Conditions
Replies: 2
Views: 90

Re: Flowering, Drought and Disease Tolerance, and Landscape Performance of Landscape Roses Grown under Low-input Conditi

Thank you Henry and Philip! It was a huge undertaking and took a lot of collaboration, volunteers, etc. to make it possible. To respond to some of the points you mentioned Philip, yes the goal was to especially trial roses that haven't been tested in the Earth-Kind manner before and only use a coupl...
by david zlesak
Sun Apr 07, 2019 10:42 am
Forum: Rose Hybridizers Association Forum
Topic: Unreduced pollen in roses
Replies: 4
Views: 96

Re: Unreduced pollen in roses

Those are great questions. It seems like with polyploid series like you mentioned Philip that the higher ploidy is found in the more harsh/severe end of the range. What I've heard is that polyploid allows for more alleles to be housed within the plant from which to hopefully accumulate alleles that ...
by david zlesak
Sat Apr 06, 2019 10:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Unreduced pollen in roses
Replies: 4
Views: 96

Unreduced pollen in roses

There is a new article studying unreduced/2n gametes in roses. Below is the link. I feel the authors did a great job studying this topic. There are some typos, lack of capitalization of rose cultivars, etc. In some of these open access journals there is often less quality control. They cited my 2009...
by david zlesak
Thu Apr 04, 2019 9:32 am
Forum: Rose Hybridizers Association Forum
Topic: more pics for i.d.
Replies: 5
Views: 147

Re: more pics for i.d.

It seems like R. canina isn't too common of a rootstock in the US. However, years back the Pavement series of rugosas first came to the Twin Cities region mainly from a Canadian nursery and they were grafted on R. canina. Over the years there have been a lot of instances where the R. canina sprouted...
by david zlesak
Tue Mar 26, 2019 12:48 pm
Forum: Rose Hybridizers Association Forum
Topic: Do more richly colored seedlings have more richly colored blooms?
Replies: 16
Views: 614

Re: Do more richly colored seedlings have more richly colored blooms?

Here are just a couple representative packs of some of the polyantha seedlings to highlight the findings. The pack on the left had richly colored seedlings and the pack on the right from the same batch of seed had more normal seedling color. There isn't too much in bloom on the left, but you can see...
by david zlesak
Tue Mar 26, 2019 12:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Hand picked - for you!
Replies: 2
Views: 127

Re: Hand picked - for you!

SYNRG™ is an interesting model/group of growers on the East Coast working together to leverage resources and sales throughout their region. This Handpicked brand is a creative way for them to not only test plants internally for the group for what are better varieties that they commit to growing for ...
by david zlesak
Thu Mar 21, 2019 10:44 am
Forum: Rose Hybridizers Association Forum
Topic: Appropriate DNA barcoding for molecular identification of rosa x damascena trigintipetala Plant growing in Taif region,
Replies: 4
Views: 99

Re: Appropriate DNA barcoding for molecular identification of rosa x damascena trigintipetala Plant growing in Taif regi

It seems odd that they would use a lot of Cinnamomeae section species in their analysis (many that are North American) and not include the reported progenitors of R. x damascena from previous studies. R. persica and R. roxburghii may be just the closest of what they sampled and making this extension...
by david zlesak
Thu Mar 14, 2019 9:56 am
Forum: Rose Hybridizers Association Forum
Topic: New Rose Rosette Virus Publication
Replies: 1
Views: 67

Re: New Rose Rosette Virus Publication

The photos and brief, but informative, descriptions are very nice.
by david zlesak
Mon Mar 11, 2019 9:47 am
Forum: Rose Hybridizers Association Forum
Topic: Still trying to wrap my head around Canninae meiosis, and how to overcome...
Replies: 12
Views: 244

Re: Still trying to wrap my head around Canninae meiosis, and how to overcome...

That's a great question Philip. Here are some thoughts that come to my mind. In the past, I found a 3x R. pomifera (it is tetraploid and in the Caninae sections). There were twins from a seed- larger was typical 4x and smaller 3x. The seed was a suspected self as R. pomifera is the first to bloom an...
by david zlesak
Sun Mar 10, 2019 12:40 am
Forum: Rose Hybridizers Association Forum
Topic: Basye's Purple (F2) with thornless and black stems.
Replies: 14
Views: 390

Re: Basye's Purple (F2) with thornless and black stems.

Dear André, Your seedling is absolutely gorgeous!!! I remember 'Basye's Purple' seeming almost sterile, so it is wonderful you have this seedling and hopefully it has improved fertility to more readily move forward. I love Joe's suggestion of'Therese Bugnet' too. It would tempting to cross it with e...
by david zlesak
Thu Mar 07, 2019 9:39 am
Forum: Rose Hybridizers Association Forum
Topic: cherry frost & lemon drift
Replies: 10
Views: 193

Re: cherry frost & lemon drift

Hi Larry, Julie's rose is amazing. It is very hardy for us with minimal tip dieback in Minneapolis at Lyndale Park Rose Garden over the years. It is triploid, but does set a limited number of op hips. It gets 5-6' in our area with a generally upright and slightly spreading form. The flowers are abun...
by david zlesak
Tue Mar 05, 2019 9:29 pm
Forum: Rose Hybridizers Association Forum
Topic: Pretty Polly series
Replies: 6
Views: 122

Re: Pretty Polly series

Thank you Joe and everyone!! :0) I sure love polyanthas and am very excited Star is introducing these. The white one and lavender one are half siblings and were seedlings way back in 1999. The Pink one is a seedling from 2008. I love the darker foliage of the white one against the blooms. The lavend...
by david zlesak
Thu Feb 28, 2019 10:46 am
Forum: Rose Hybridizers Association Forum
Topic: The volume of Acta Horticulturae with rose articles from the meetings in Angers France is out!!
Replies: 3
Views: 127

The volume of Acta Horticulturae with rose articles from the meetings in Angers France is out!!

It is great that the papers associated with talks and posters from the VII International Symposium on Rose Research and Cultivation in Angers France in 2017 just came out!! Here is a link to the articles in the volume. Even though many of us may not have free access to whole articles, we can at leas...
by david zlesak
Thu Feb 28, 2019 9:37 am
Forum: Rose Hybridizers Association Forum
Topic: genetic incompatability? What do you think?
Replies: 13
Views: 224

Re: genetic incompatability? What do you think?

This is a little different in terms of oddities in this picture, but generally, like mentioned, it seems for me too that wider crosses tend to have more oddities. Years ago Julie Overom wrote a nice article on Incongruity in the RHA newsletter. We can have hybrid vigor, but also hybrid breakdown and...
by david zlesak
Sun Feb 24, 2019 12:16 pm
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 55
Views: 1193

Re: Hardy, Everblooming Climbers

That is great news that R. maximowiziana may have some tolerance/resistance to RRD. The form I have is from Dr. Peter Ascher, retired from the U of MN. He got seeds many years ago from a Russian scientist from a botanical garden over there as thank you for something. Peter raised the seed and share ...
by david zlesak
Tue Feb 19, 2019 11:21 am
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 55
Views: 1193

Re: Hardy, Everblooming Climbers

I love R. maximowicziana for a hardiness. It is pretty cane hardy in zone 4 and crosses of it with polyanthas made some pretty hardy one time blooming rambler types. Most are blush to white though, so it may take a couple generations to bring in richer colors. Backcrossing these first generation hyb...
by david zlesak
Fri Feb 15, 2019 1:43 pm
Forum: Rose Hybridizers Association Forum
Topic: Optimizing culture medium ingredients and micrografting devices can promote in vitro micrografting of cut roses on diffe
Replies: 1
Views: 30

Re: Optimizing culture medium ingredients and micrografting devices can promote in vitro micrografting of cut roses on d

This is pretty neat!! I can see some of the advances they made hopefully being applied to clean roses up of virus. It is challenging to grow some roses in culture from meristems to get clean stock and then root them once it is time to come out. Being able to graft short stems of struggling tissue th...
by david zlesak
Mon Feb 04, 2019 9:47 pm
Forum: Rose Hybridizers Association Forum
Topic: First germination of the winter
Replies: 120
Views: 2529

Re: First germination of the winter

Hi Rob!! I'm glad you like and are using 'Gaye Hammond'. That sounds like a wonderful cross. I love its vigor. I knew it was special as a first year seedling and took a number of cuttings of it while it was on the plant stand the winter it germinated before planting it out. It's glossy leaves and vi...
by david zlesak
Sat Feb 02, 2019 10:39 am
Forum: Rose Hybridizers Association Forum
Topic: Disease? recognize these spots?
Replies: 11
Views: 107

Re: Disease? recognize these spots?

They are sure small and blend in well. They scrape the lower sides of the leaves leaving a "window paning" effect. There are 3 species around here in the Twin Cities area. Two have just one cycle per year and after June the new growth is okay. The bristly rose sawfly/slug has multiple cycles per yea...