Search found 1361 matches

by Karl K
Mon Jan 04, 2021 6:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 325

Re: Can Somebody Explain 'Replicative Fading'?

Though this report deals with humans, the underlying principle may well apply to plants. Therefore, two cuttings from a seedling may become epigenetically distinct, more so the older they become, and even more so when they have been exposed to different environmental histories. In past centuries it ...
by Karl K
Sun Jan 03, 2021 7:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 325

Re: Can Somebody Explain 'Replicative Fading'?

I remembered that this subject was discussed on rec.gardens.roses back in the '90s. Here's a snippet I found today. Some of the "degradation" described could be the result of poor propagation practices, and might be repaired by careful bud selection ... if anyone wants to make the effort. Also, I ad...
by Karl K
Thu Dec 31, 2020 12:48 am
Forum: Rose Hybridizers Association Forum
Topic: Can Somebody Explain 'Replicative Fading'?
Replies: 9
Views: 325

Re: Can Somebody Explain 'Replicative Fading'?

I have obtained several rose books for a Christmas gift. One of them mentions the concept of 'replicative fading'. I am rather confused as to what this exactly entails. The book used 'Peace' as an example of a rose that has been regarded through reckless duplication via cutting. So, are the cutting...
by Karl K
Mon Dec 14, 2020 7:18 pm
Forum: Rose Hybridizers Association Forum
Topic: Heat vs. Petals
Replies: 0
Views: 311

Heat vs. Petals

A week ago or so I saw some surprising pictures of 'Agnes' (H. Rugosa) bearing pink flowers rather than the usual light amber-yellow. Patricia Routley explained that the flowers opened following a heat wave. She also noted that the flowers had fewer flowers than usual. That rang a bell for me. https...
by Karl K
Sun Dec 06, 2020 8:34 am
Forum: Rose Hybridizers Association Forum
Topic: Rust
Replies: 6
Views: 503

Re: Rust

This seems like a good place to mention older efforts to breed for resistance to fungal infections. http://bulbnrose.x10.mx/Roses/breeding/FishRoseRust1898.html Fish: Orange-fungus on Roses (1898) I have long known that the red-rust seldom or never attacks Teas, Hybrid Teas, Noisettes, Bourbons, Chi...
by Karl K
Sat Dec 05, 2020 6:10 pm
Forum: Rose Hybridizers Association Forum
Topic: Handling cold-hardiness
Replies: 18
Views: 2130

Re: Handling cold-hardiness

Today I happened upon another factor that had not occurred to me. The color of the canes and branches can influence winter hardiness. There is not mystery to it once we set the stage. Suppose the temperature is hovering about freezing. Sun is shining and branches that are black or brown will be abso...
by Karl K
Wed Nov 25, 2020 9:30 am
Forum: Rose Hybridizers Association Forum
Topic: Apples and Oranges
Replies: 30
Views: 2845

Re: Apples and Oranges

It is possible that Rosa foetida did contribute in a useful way with a trait I've been calling "dominant non-red". At the Heritage Rose Garden in San Jose, CA, I saw an alleged "Harison's Yellow' developing a red flush following a heatwave. This occurred in June 2003 and again in June 2006. http://b...
by Karl K
Mon Nov 23, 2020 7:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Apples and Oranges
Replies: 30
Views: 2845

Re: Apples and Oranges

It may be that Rosa foetida is not the only species that contributed to the lilac color of 'Grey Pearl', 'Sterling Silver' and so one. I've been reading about the colors and color patterns of sweet peas. A strain called 'Blue Shift' caught my attention because the blooms start out a purply pink then...
by Karl K
Thu Nov 12, 2020 10:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Splash and Dash equals Bad Technique?
Replies: 36
Views: 1533

Re: Splash and Dash equals Bad Technique?

There are a couple of techniques that might help encourage flowering and hip set. These are Binding and Ringing. Binding involves nothing more than wrapping a strong string or twine around a cane and tie it tight enough to impede the downward movement of carbohydrates, protein and such, while not bl...
by Karl K
Tue Nov 10, 2020 11:55 am
Forum: Rose Hybridizers Association Forum
Topic: Memory stress test
Replies: 7
Views: 494

Re: Memory stress test

Some of the "geneticists" (or fruitfly breeders) seemed to consider organisms to be collections of traits. They held a static view of the subjects, mostly ignoring the developmental processes that made a completed plant or animal from a fertilized egg. This developmental program is too easily ignore...
by Karl K
Tue Nov 10, 2020 11:34 am
Forum: Rose Hybridizers Association Forum
Topic: Memory stress test
Replies: 7
Views: 494

Re: Memory stress test

Researchers Surprised After They Graft Tomato Plants With Epigenetically-Modified Rootstock It might be time to re-examine some facts that were already established in the early 19th century. For instance, William Prince, the once-famous nurseryman of Long Island, NY, reported (1832) an important ob...
by Karl K
Mon Nov 09, 2020 12:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Splash and Dash equals Bad Technique?
Replies: 36
Views: 1533

Re: Splash and Dash equals Bad Technique?

There is not much you can do if the pollen triggers an SI mechanism. I have read of a few techniques to defeat the self-incompatibility trap, but only one seems applicable to roses: stylar amputation. The SI rejection mechanism apparently works in the style. Remove the style and the problem is solv...
by Karl K
Sat Nov 07, 2020 2:10 pm
Forum: Rose Hybridizers Association Forum
Topic: Splash and Dash equals Bad Technique?
Replies: 36
Views: 1533

Re: Splash and Dash equals Bad Technique?

Exactly! I couldn't learn much about blackspot resistance in the years I spent studying roses at the San Jose Heritage, though I did learn something about mildew. I hadn't even noticed until someone directed my attention to the China-Teas (or are they Tea-Chinas? The flowers are smallish, like China...
by Karl K
Sat Nov 07, 2020 12:58 pm
Forum: Rose Hybridizers Association Forum
Topic: Splash and Dash equals Bad Technique?
Replies: 36
Views: 1533

Re: Splash and Dash equals Bad Technique?

I remember the story of Lammerts' blackspot resistant line of roses. He thought he had the problem licked. Then he moved from Livermore to the Watsonville area. His best, most resistant cultivars got the Spots. And I may note that 'New Dawn' is usually pretty clean. But it does get a furry coat of m...
by Karl K
Thu Nov 05, 2020 1:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Best Rootstock for Grafting/Budding
Replies: 1
Views: 356

Re: Best Rootstock for Grafting/Budding

I don't do any grafting, but I do collect reports from those who do.

Here's a bibliography that may help pick the right stock for various types of soil and climate.

http://bulbnrose.x10.mx/Roses/breeding/RootsSoil.html
by Karl K
Mon Oct 26, 2020 6:53 pm
Forum: Rose Hybridizers Association Forum
Topic: Memory stress test
Replies: 7
Views: 494

Re: Memory stress test

I forgot to add a link to my bibliography on the subject. http://bulbnrose.x10.mx/KKing/Acquired.html Graft transmission is related, but I have a separate bibliography for it. http://bulbnrose.x10.mx/KKing/StockScion.html And a bibliography of Epigenetics and related matters. http://bulbnrose.x10.mx...
by Karl K
Mon Oct 26, 2020 4:17 pm
Forum: Rose Hybridizers Association Forum
Topic: Memory stress test
Replies: 7
Views: 494

Re: Memory stress test

Or should I say Stress Memory Test? Researchers Surprised After They Graft Tomato Plants With Epigenetically-Modified Rootstock https://scitechdaily.com/researchers-surprised-after-they-graft-tomato-plants-with-epigenetically-modified-rootstock/ At first read this article seemed like a flashback to...
by Karl K
Sun Oct 25, 2020 12:24 am
Forum: Rose Hybridizers Association Forum
Topic: "Outbox" vs "Sent"
Replies: 6
Views: 492

Re: "Outbox" vs "Sent"

That's how I see it . Outbox = to go out. Sent = already gone.