Search found 310 matches

by Larry Davis
Mon Aug 13, 2018 7:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Thread about rose rosette virus in commercial roses
Replies: 5
Views: 210

Re: Thread about rose rosette virus in commercial roses

This does make me just a little nervous. AS I mentioned on a thread earlier this year, I got Easy on the Eyes for $4 at Menards ( a big midwestern hardware chain). They had 2 whole pallets, at least 2 cu yd deep boxes, full of bagged roses labeled # 1&1/2. But what I bought looked like it was #1 gra...
by Larry Davis
Thu Aug 02, 2018 8:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Moving micro minis indoors
Replies: 10
Views: 216

Re: Moving micro minis indoors

I can see that beating mite eggs is really hard. And unfortunately the microwave will not kill the eggs directly, just as it won't kill cockroaches. They have to be poached by the steam or directly hard boiled. Sometimes quick-freezing will kill insects, though the eggs may be full of antifreeze mol...
by Larry Davis
Thu Aug 02, 2018 8:26 pm
Forum: Rose Hybridizers Association Forum
Topic: Disease resistance
Replies: 4
Views: 111

Re: Disease resistance

Back a few decades ago someone named Joe Kuc (not sure of spelling last name) discovered systemic acquired resistance in plants. He was a plant pathologist in Kentucky and came here to give a talk in our PlPath dept. I visited with him for an hour or so. In the instance he was studying the resistanc...
by Larry Davis
Thu Jul 26, 2018 7:22 pm
Forum: Rose Hybridizers Association Forum
Topic: Moving micro minis indoors
Replies: 10
Views: 216

Re: Moving micro minis indoors

My usual problem going from outdoors to indoors is spidermites on roses. Thrips can be a problem with other plants but doesn't seem to be much with roses, other than eating pollen. I just whack the plants and let them grow back outdoors while the cuttings are under lights in a nice, "sterile" pottin...
by Larry Davis
Sat Jul 21, 2018 11:10 pm
Forum: Rose Hybridizers Association Forum
Topic: Self-Incompatibility
Replies: 23
Views: 570

Re: Self-Incompatibility

I was using a sort of shorthand when I mentioned "crosses with itself". I intend it as a logical possibility to compare with the cross to a different hybrid (that is one with different parents). If the species has strong self-incompatibility then of course this logical possibility of selfing is skip...
by Larry Davis
Thu Jul 19, 2018 9:06 am
Forum: Rose Hybridizers Association Forum
Topic: Self-Incompatibility
Replies: 23
Views: 570

Re: Self-Incompatibility

Yes Karl, you are right in that last post. I didn't want to get into details in my post above. There are too many incompatibility systems to deal with, and I don't know just how roses do it. For Brassicas, pollination prior to flower opening overcomes the SI if you really want essentially homozygous...
by Larry Davis
Wed Jul 18, 2018 10:49 pm
Forum: Rose Hybridizers Association Forum
Topic: Remontancy
Replies: 15
Views: 743

Re: Remontancy

Goldilocks here is about the same as Doubloons, perhaps a bit worse. Allgold didn't last long either. And Golden Slippers is maybe worse than either. I mean for hardiness and BS. Beautiful flower for about 5 hours. That's why I produced Ruby Slippers (13-2).
by Larry Davis
Wed Jul 18, 2018 10:39 pm
Forum: Rose Hybridizers Association Forum
Topic: Self-Incompatibility
Replies: 23
Views: 570

Re: Self-Incompatibility

Without knowing actual mechanisms of incompatability I can think of some simple reasons for the ploidy effect. Assume that immunity requires recognition of "other". Therefore it requires recognition of "self" and a way to prevent responding to self in a bad way. That is how it works in humans. Some ...
by Larry Davis
Tue Jul 10, 2018 6:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 40
Views: 994

Re: Under-utilized species you feel might have merit

The postage is only 7. 50 or so for a small priority mail package. By winter these will not be all that big. A couple dozen easily fit inside. Pot them up, select the first to bloom, or one with fewest prickles, or best foliage or whatever. Blooms might take a couple years if they are like other spe...
by Larry Davis
Mon Jul 09, 2018 10:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 40
Views: 994

Re: Under-utilized species you feel might have merit

About R. palustris. I have little personal experience with it, though for decades I grew a plant that I brought from western PA that was probably it. I dug it out of a hillside bog there. May still be out in my wilderness though this year's drought may have done it in. Never got enough seed to get g...
by Larry Davis
Fri Jul 06, 2018 9:22 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 40
Views: 994

Re: Under-utilized species you feel might have merit

That is a really interesting hybrid. Why does it bloom now? Hugonis is really early blooming and I thought wichurana was only moderately late. Maybe I was fooled by Dr. van Fleet bloom time. Or i this a second flush?
by Larry Davis
Thu Jul 05, 2018 11:56 pm
Forum: Rose Hybridizers Association Forum
Topic: RRV in Rugosa
Replies: 1
Views: 128

Re: RRV in Rugosa

I have very few rugosas and not a lot of RRD, but last year I lost 8 or 10 plants of mixed kinds because I took a wait and see attitude in one area of the garden. For high value plants I try to cut it out at the base of canes and with some I have successfully saved them. This spring I saw RRD on Bel...
by Larry Davis
Tue Jul 03, 2018 6:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Breeding plans for 2018
Replies: 38
Views: 2720

Re: Breeding plans for 2018

For mnemko: Well, 13-1 is intense yellow, so you'd have to use a strong red at the very least. OTOH Rainbow KO as pollen donor to Playboy and Feu Josef Looymans gave the darkest reds I've seen. I didn't catch from your original post that your were targeting only red. The range of potential parents l...
by Larry Davis
Sat Jun 30, 2018 9:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Breeding plans for 2018
Replies: 38
Views: 2720

Re: Breeding plans for 2018

On 4 plants I found only 9 pieces without either a hip or a flower or bud. But we'll see how those 9 turn out.

Last fall I took cut flowers of 13-2 and stuck them into potting mix and they all grew. Some selections really root easily.
by Larry Davis
Sat Jun 30, 2018 8:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Breeding plans for 2018
Replies: 38
Views: 2720

Re: Breeding plans for 2018

So here it is almost July 1 and I think I may have a plan. Our wretched cold spring with repeated frosts, followed by sudden heat led to some odd replanning. Or non-planning, and certainly some unplanning. Might I suggest to mnemko that my 13-1 is worth consideration. Here's why. It came out of a cr...
by Larry Davis
Fri Jun 22, 2018 10:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Diploid vs Tetraploid - a crossroads
Replies: 15
Views: 614

Re: Diploid vs Tetraploid - a crossroads

I think that you will have to live through he triploid stage. Looks like a diploid trait will be harder to move to tetraploids than the other way round. It ought to be easier to bring repeat blooming to diploids than to take rugose foliage to tetraploids. I did a quick google search on tetraploid in...
by Larry Davis
Mon Jun 18, 2018 8:16 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature effect on bloom form
Replies: 17
Views: 587

Re: temperature effect on bloom form

Yes, of course. The developmental program switches the pathways on and off to give all sorts of patterns. Red stamens, filaments, stigmas and styles are all independent of the patterns in the petals like central blotch, central yellow eye with sharp changes ( like Golden Slippers to pink or to red o...
by Larry Davis
Mon Jun 18, 2018 6:58 pm
Forum: Rose Hybridizers Association Forum
Topic: Remontancy
Replies: 15
Views: 743

Re: Remontancy

Unfortunately Doubloons isn't actually hardy below 0 F and it is one of the worst black-spotters around. Can't comment on Mr. Nash.

I'm still using a couple Doubloons offspring but most have expired naturally. Well over 100 of them.
by Larry Davis
Mon Jun 18, 2018 6:51 pm
Forum: Rose Hybridizers Association Forum
Topic: temperature effect on bloom form
Replies: 17
Views: 587

Re: temperature effect on bloom form

I meant mechanistically at the biochemical level, not for imagining things through thinking by analogy. For plant people to talk of rabbits was once considered hareasy. Just pull one out of a hat. We focused on sweet peas (see my paper on "Origin of the Punnett Square") not the buggers that eat them...
by Larry Davis
Sun Jun 17, 2018 8:13 pm
Forum: Rose Hybridizers Association Forum
Topic: -Rising-Star-Awardee-Christian-Bedard
Replies: 6
Views: 304

Re: -Rising-Star-Awardee-Christian-Bedard

Interesting stats on the Weeks operation. Notice only 6 seeds per pollination. High failure rate at hip formation? Or low fertility crosses? Recall that seeds =/= seedlings. With 25 % germ/emergence/transplant survival it might be 6 intros per year out of 60,000 transplantable seedlings. Some parent...