Search found 121 matches

by Plazbo
Sat Oct 13, 2018 9:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Compound Identification of Selected Rose Species and Cultivars: an Insight to Petal and Leaf Phenolic Profiles
Replies: 15
Views: 870

Re: Compound Identification of Selected Rose Species and Cultivars: an Insight to Petal and Leaf Phenolic Profiles

I have been trying for a decade to get a copy of Lemon Delight to cross with my mossed glutinosa f1's that have retained their pine scent. Not only does Lemon Delight apparently express lemonene but it is one of the very few, two maybe, hybrids between a hard moss and a soft moss. I think Burling i...
by Plazbo
Wed Sep 26, 2018 8:06 pm
Forum: Rose Hybridizers Association Forum
Topic: R. bracteata x Carefree Copper
Replies: 15
Views: 1170

Re: R. bracteata x Carefree Copper

I have often wondered whether R. foetida might be more fertile if it were allowed to go dormant during the heat of summer, rather than forced to grow on borrowed roots. Karl May be able to answer that next year. Have planted mine below the graft hoping for it to go own root (i like to see to what e...
by Plazbo
Mon Aug 27, 2018 3:21 am
Forum: Rose Hybridizers Association Forum
Topic: Remontancy
Replies: 25
Views: 2486

Re: Remontancy

That's kind of why I'm basing rugosa around Schneezwerg and Calocarpa. The former has demonstrated a small capacity of fertile crosses with tea/china and the latter is half china. Will see what happens in the season that's approaching. Bound to be a lot of sterile but selection over a few gens will ...
by Plazbo
Sun Aug 26, 2018 7:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Remontancy
Replies: 25
Views: 2486

Re: Remontancy

Plazbo, my OP Alderman seedlings that bloomed as juvies are seeming pretty weak. I doubt they will amount to anything. I do, however, have some juvi bloomers from crosses with Ann Endt, Belle Poitevine, and a rugosa seedling. We'll see how that goes. Possibly just the juvenile phase or investment i...
by Plazbo
Tue Aug 14, 2018 3:42 am
Forum: Rose Hybridizers Association Forum
Topic: Thread about rose rosette virus in commercial roses
Replies: 5
Views: 534

Re: Thread about rose rosette virus in commercial roses

Parent company declares bankruptcy, one of the acquired companies (these are typically held for legal and tax loop holes) is "liquidated" to someone connected to the owner/s, company is liable (and bankrupt) the owner typically won't be if they've set up the company to typical standards. It's a fair...
by Plazbo
Tue Aug 14, 2018 12:00 am
Forum: Rose Hybridizers Association Forum
Topic: Thread about rose rosette virus in commercial roses
Replies: 5
Views: 534

Re: Thread about rose rosette virus in commercial roses

Being cynical, they could be attempting scorched earth. I mean they knew they had it for a few years before it became public, thats effort to destroy the business...unless they pull everyone else/competition down to the same level. Aren't likely to go out of business if everyone else is infected too.
by Plazbo
Wed Jul 18, 2018 6:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Self-Incompatibility
Replies: 24
Views: 1456

Re: Self-Incompatibility

Re diploid species incompatible but diploid hybrid not being. The two species may have different self fertilisation barriers and neither are dominant/are compatible with each other or are located in different loci allowing the genes to be removed in further generations. Breeders would likely select ...
by Plazbo
Mon Jul 02, 2018 2:20 am
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 62
Views: 4116

Re: Under-utilized species you feel might have merit

R. clinophylla for those of us in the warmer climates. Seeing as it grows in one warmest ranges for roses and survives flooding there's potential there. I think the only source of it in Australia may be Simon who's been MIA so may not be able to get access to it. R. micrantha, an alternative to R. r...
by Plazbo
Sun Jul 01, 2018 12:36 am
Forum: Rose Hybridizers Association Forum
Topic: Breeding plans for 2018
Replies: 38
Views: 3795

Re: Breeding plans for 2018

It's been 4 months since the initial post and my plans have altered somewhat. 1 - Foliage/sepals fragrance Still intend to pursue foilage fragrance via Lord and Lady Penzance. Have a 100+ Lord Penzance seedlings at the moment and a bunch of R. Rubiginosa OP from seed collected from feral plants in S...
by Plazbo
Fri Jun 29, 2018 3:47 am
Forum: Rose Hybridizers Association Forum
Topic: yellow rugosas
Replies: 12
Views: 700

Re: yellow rugosas

I did considerable work with Dr. Svedja' crosses. I liked what I got and I tried to encourage others to do also, but I do not think that anyone else did. Her early dipoid work has inspired me some. I likely wouldn't be looking at diploids like i currently do without reading some of the papers and r...
by Plazbo
Thu Jun 28, 2018 6:57 pm
Forum: Rose Hybridizers Association Forum
Topic: yellow rugosas
Replies: 12
Views: 700

Re: yellow rugosas

Tom Silvers made the cross rugosa x xanthina, but he writes that the hybrid has low fertility: http://maprc.blogspot.com/2012/11/rosa-rugosa-x-xanthina.html Its possibly a case of results will vary. I mean most rugosa x china are sterile to low fertility but a few are fertile. Dr Svedja did a numbe...
by Plazbo
Fri Jun 22, 2018 8:00 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 15
Views: 1037

Re: Diploid vs Tetraploid - a crossroads

Juvenile blooming is independent of the "gene for rebloom". De Vries: Juvenility in HT Roses (1976) http://bulbnrose.x10.mx/Roses/breeding/DeVriesJuvenile1976a/DeVriesJuvenile1976a.html De Vries, Dubois: Juvenile Period in HT Roses (1977) http://bulbnrose.x10.mx/Roses/breeding/DevriesJuvenile1977/D...
by Plazbo
Sat Jun 16, 2018 8:10 am
Forum: Rose Hybridizers Association Forum
Topic: Remontancy
Replies: 25
Views: 2486

Re: Remontancy

Some rugosas can produce juvi-blooming F1's when crossed with moderns. I noticed about three or four out of twenty Will Alderman x OP seedlings that are blooming as youngsters. On the other hand, I have dozens or hundreds of seedlings from another remontant rugosa that are not blooming as youngster...
by Plazbo
Mon Jun 11, 2018 2:29 am
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 15
Views: 1037

Re: Diploid vs Tetraploid - a crossroads

The end of the opening paragraph is a bit...questionable. Polyploidy for daylilies comes at a cost, significantly reduced seed set (often around 6 seed per tet cross but over 30 per dip cross) so advantageous reproduction possibly not. The flowers are generally more showy/larger/thicker with tets bu...
by Plazbo
Sat Jun 09, 2018 8:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 15
Views: 1037

Diploid vs Tetraploid - a crossroads

I've been reading and gotten myself in a loop. I know there are people with far more scientific/technical understanding and familiarity here than I do so just looking for opinions/thoughts. Being in Australia, a generally favourable climate except those few weeks or summer with 40C+/100F+ temps. I'v...
by Plazbo
Fri May 11, 2018 8:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 1201

Re: Canina Chromosome pairing

I am working with Lord Penzance, Lady Penzance will be coming in the next few months. Given a few comments on here i shouldn't expect germination until the second season so probably wont be til next year to see if any of the couple hundred Lord P seeds germinate I couldn't see an edit button but ju...
by Plazbo
Wed May 09, 2018 10:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 1201

Re: Canina Chromosome pairing

That'll teach me to not look it up while on the train to work. Still it is a fertile triploid so should be less difficult to work with. They all trace back to Magnifica. On a slight tangent everything in my signature has some connection to one of the three. Given RADsweet I wouldnt be surprised if i...
by Plazbo
Wed May 09, 2018 6:44 pm
Forum: Rose Hybridizers Association Forum
Topic: Canina Chromosome pairing
Replies: 23
Views: 1201

Re: Canina Chromosome pairing

Not sure though it is easy to obtain a fertile tetraploid though, so the genes can be passed on to its offspring... I am working with Lord Penzance, Lady Penzance will be coming in the next few months. Given a few comments on here i shouldn't expect germination until the second season so probably w...
by Plazbo
Wed Apr 18, 2018 8:34 am
Forum: Rose Hybridizers Association Forum
Topic: early culling of species seedlings...
Replies: 11
Views: 793

Re: early culling of species seedlings...

I'd imagine it'd depend on what species and what you were intending from the cross, I feel like usually there's an aim when using a species, I mean some species are obvious like R. glauca (thornless and foliage colour are likely the main superficial traits people are after from it). It'd also depend...