Search found 427 matches

by david zlesak
Thu Apr 01, 2021 10:01 pm
Forum: Rose Hybridizers Association Forum
Topic: New article on repeat bloom
Replies: 2
Views: 305

New article on repeat bloom

This is a great article that advances some of the previous work from this team in France understanding the key gene for repeat bloom and variants of it and suggests there are additional factors/genes governing repeat bloom yet too in some of the roses with more modest rebloom as well. https://www.na...
by david zlesak
Sun Mar 14, 2021 11:26 am
Forum: Rose Hybridizers Association Forum
Topic: Colchicine induction of ‘Old Blush’ 2n pollen for the hybridization and breeding of tetraploid rose
Replies: 6
Views: 685

Re: Colchicine induction of ‘Old Blush’ 2n pollen for the hybridization and breeding of tetraploid rose

Wow, this is fascinating!!! Hmm. I wonder if we'd have even better success using trifluralin or oryzalin as they seem to be more effective against plant microtubules and at lower concentrations. I have to think about which diploid parents I may want to try this on. Thanks Henry for passing along the...
by david zlesak
Wed Mar 10, 2021 3:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Question about crosses with once bloomers
Replies: 14
Views: 1075

Re: Question about crosses with once bloomers

This may not reflect exactly what you'll find with your specific crosses, but Dr. Mitchell's crosses with 'Alika' may be of interest.
http://www.globalsciencebooks.info/Onli ... 46-52o.pdf
by david zlesak
Sat Mar 06, 2021 5:15 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose seeds for sale this spring at a box store!
Replies: 4
Views: 654

Rose seeds for sale this spring at a box store!

The past couple years this product was for sale at a regional home improvement box store. In past years they had 'Angel Rose' polyantha seeds in them, which was nice and probably would germinate okay for people (about 25 seeds or so in the packet). This year I thought I'd buy one and when I got it h...
by david zlesak
Mon Feb 22, 2021 9:05 pm
Forum: Rose Hybridizers Association Forum
Topic: Flash breeding around the corner for roses?
Replies: 2
Views: 364

Re: Flash breeding around the corner for roses?

This is amazing Don!! Wow, this could be super useful in many slow to mature perennial crops. I've sat in presentations where people used transgenic apples to get early flowering and then they just select the offspring that don't have the transgene to identify possible plants that could be commercia...
by david zlesak
Mon Feb 22, 2021 8:56 pm
Forum: Rose Hybridizers Association Forum
Topic: Lifespan of frozen pollen
Replies: 3
Views: 484

Re: Lifespan of frozen pollen

Hi Duane!

I have used 2 year old pollen successfully that has been frozen. I don't know how much viability goes down for sure, but I was able to get successful seed set this past year from pollen collected 2018.
by david zlesak
Sat Feb 20, 2021 5:10 pm
Forum: Rose Hybridizers Association Forum
Topic: A lot of work and a little luck
Replies: 12
Views: 799

Re: A lot of work and a little luck

Your seedling is gorgeous!! I love the glossy dark leaves and full petaled blooms. Is it a miniature? I've gotten seedlings with some similar characteristics out of 'Rise 'N Shine'. Minis can be great for helping produce a nicely branched plant (as well as polyanthas).
by david zlesak
Thu Feb 11, 2021 10:59 am
Forum: Rose Hybridizers Association Forum
Topic: New: Nitty Gritty Series
Replies: 2
Views: 377

Re: New: Nitty Gritty Series

I'm excited to hopefully find them this summer and try them. They look really nice. It is great Monrovia has the option to buy them on their website and we can have them dropped off at a local garden center that buys in Monrovia products with their trucks going that direction anyways. It seems reall...
by david zlesak
Sun Feb 07, 2021 5:55 pm
Forum: Rose Hybridizers Association Forum
Topic: My Yellow Hybrid China, Champagne Bubbles
Replies: 9
Views: 921

Re: My Yellow Hybrid China, Champagne Bubbles

Your hybrid looks beautiful Joan! Those roots on the cuttings look really nice and robust too!!
by david zlesak
Mon Feb 01, 2021 11:20 pm
Forum: Rose Hybridizers Association Forum
Topic: Alternate source for repeat bloom
Replies: 41
Views: 5157

Re: Alternate source for repeat bloom

I wish I understood the interactions between the genes in the flowering pathway better... I get confused easily and have to review the basics again when I try to keep straight in my mind the role of RoKSN (aka TFL1), FD, Leafy, etc. Anyways, in 2017 at the rose meetings in Anger Dr. Fabrice Foucher ...
by david zlesak
Fri Jan 29, 2021 10:19 am
Forum: Rose Hybridizers Association Forum
Topic: Rust
Replies: 8
Views: 1002

Re: Rust

Hi Larry,

If I remember right the ones I sent trace back to seed sent from Boerner Botanical Gardens in the Milwaukee area in the 1960's or early 1970's, but I couldn't find information on where they obtained their plants.
by david zlesak
Thu Jan 14, 2021 3:56 pm
Forum: Rose Hybridizers Association Forum
Topic: Koppen Geiger Climate
Replies: 2
Views: 364

Re: Koppen Geiger Climate

Hi Sarah! The American Rose Trials for Sustainability (trustedroses.org) uses this system too for regional awards. The combination of temperature and precipitation patterns seems to make it more useful than just the minimum coldest temperature like for the USDA Cold Hardiness zones https://www.ameri...
by david zlesak
Sat Jan 09, 2021 12:03 am
Forum: Rose Hybridizers Association Forum
Topic: Another virus that infects roses found
Replies: 2
Views: 323

Re: Another virus that infects roses found

Dimitre and Maher do such great work and it is nice they are mentoring others in these techniques. I'm grateful they continue to do virus discovery work with roses, especially when it is generally easier for them to secure money to characterize new viruses in other crops.
by david zlesak
Wed Jan 06, 2021 8:45 pm
Forum: Rose Hybridizers Association Forum
Topic: opinions on retaining a seedling
Replies: 3
Views: 447

Re: opinions on retaining a seedling

I doubt it too.... The resistance is dominant. Brite Eyes has only one copy of that dominant allele across its 4 sets of chromosomes and just a portion of its seedlings inherit it. There is a race of black spot that can overcome Brite Eyes, but most all the races in our collection don't. If your BE ...
by david zlesak
Tue Dec 29, 2020 11:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 770

Re: Can Somebody Explain 'Replicative Fading'?

That's a great question... I assume they mean that through many years and propagation cycles plants begin to show "drift" / decline in terms of performance, especially if careful attention isn't given to propagating from just the most representative plants. For part of my Ph.D. I studied performance...
by david zlesak
Sun Dec 27, 2020 6:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Rooted Cuttings Failure Question?
Replies: 36
Views: 3923

Re: Rooted Cuttings Failure Question?

Hi Philip, I ordered the liquid form of Bti from a Florida pond supply company (123Ponds; I think it was a 6 or 8 ounce bottle, I have to check- it was about $20 I think). Their main customers are using it for mosquito control in ponds and that is what is on the label when it came, but the website s...
by david zlesak
Fri Dec 25, 2020 5:35 pm
Forum: Rose Hybridizers Association Forum
Topic: rugosa x glauca
Replies: 6
Views: 925

Re: rugosa x glauca

Hi Duane!! I'm excited for you to follow these. Hopefully you can just put them all into larger pots and prune them as needed to keep them all in their space allotted until spring. It would be a shame if they vary for health and other traits and you miss the opportunity to discover those things at t...
by david zlesak
Tue Dec 22, 2020 11:42 am
Forum: Rose Hybridizers Association Forum
Topic: Rooted Cuttings Failure Question?
Replies: 36
Views: 3923

Re: Rooted Cuttings Failure Question?

That is wonderful rikuhelin1!! I'm so glad they are taking. Thank you so much again Stefan!! I got Bacillus thuringiensis subsp./var. israelensis and it is working. After the first application it really knocked the fungus gnats down and a couple weeks after now I mixed some more and treated again. I...
by david zlesak
Thu Dec 17, 2020 3:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Scandinavian Import ID Challenge - Needle in Haystack Quest?
Replies: 25
Views: 3652

Re: Scandinavian Import ID Challenge - Needle in Haystack Quest?

Hmmmm It looks like the rose I've seen in the past at the MN Landscape Arboretum labeled 'Kakwa', a spin hybrid. The wide hypanthium under the sepals suggests Spin hybrid to me. At the MNLA 'Kakwa' got about chest high and 6-8' wide and died back somewhat each winter.
by david zlesak
Sun Dec 06, 2020 11:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Rust
Replies: 8
Views: 1002

Re: Rust

I added a link to a paper by Dr. Kermani et al., 2009 characterizing various species of fungi causing rust in roses. This seems like a pretty diverse group of pathogens for having such a variation of species causing similar symptoms and growers calling it all by the same disease name. http://www.glo...