Search found 425 matches

by Larry Davis
Sat Sep 06, 2014 12:24 am
Forum: Rose Hybridizers Association Forum
Topic: Controlling Algae
Replies: 10
Views: 1392

Re: Controlling Algae

Ordinary algae are not harmful. But my observation is that blue-greens (cyanobacteria) seem to have allelopathic toxins. they definitely steal iron from hydroponics. I doubt you could get enough UV to kill them. I feel really sorry for aquarium fish if they are being irradiated to try to kill algae....
by Larry Davis
Fri Aug 22, 2014 12:24 am
Forum: Rose Hybridizers Association Forum
Topic: How do I renovate containerized breeders?
Replies: 13
Views: 1390

Re: How do I renovate containerized breeders?

Why would they need rejuvenation? salt build-up, potbound, soil densification, too much top for root volume? I kept a number of roses in pots for quite a few years, going into a small greenhouse every winter. At mid-winter if they've gone dormant you can prune them back, replace the soil mix and the...
by Larry Davis
Wed Aug 20, 2014 7:16 pm
Forum: Rose Hybridizers Association Forum
Topic: Has anyone read this?
Replies: 11
Views: 1086

Re: Has anyone read this?

Unfortunately our paper copy is stored off-site, and so inaccessible except by ILL or once a week in real book. this is a 5 pg paper and I can see the first 2 pages online by putting in the title and the journal name in a google search Springer is publisher. So can you. The summary, introduction and...
by Larry Davis
Wed Aug 20, 2014 7:03 pm
Forum: Rose Hybridizers Association Forum
Topic: Has anyone read this?
Replies: 11
Views: 1086

Re: Has anyone read this?

If you are not a big corporation, you ought to be able to get the paper by something like interlibrary loan for a whole lot less. Or ask a member to share a pdf. If it's for your own personal use and research that is considered fair use. I haven't had a chance to see if our library has electronic or...
by Larry Davis
Tue Aug 19, 2014 6:21 pm
Forum: Rose Hybridizers Association Forum
Topic: Canadian hardiness
Replies: 23
Views: 2067

Re: Canadian hardiness

If you look in detail at states, by county, you will see that sightings in some are very sparse for any species. May be the same for Canadian provinces. Also, native species have many sub-species which may well differ a lot in hardiness. I know that's true for many decoratives like dogwood.
by Larry Davis
Mon Aug 18, 2014 9:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Can anything be diserned by comparitive size of hip
Replies: 6
Views: 949

Re: Can anything be diserned by comparitive size of hip

I assume you mean on one particular CV. In that case, for some CV, yes the size is relatively proportional to # seeds contained. I have a lot of crosses giving only 1-2 seeds and they are definitely a good deal smaller than those with many on the same CV. But if the hip wall thickness is constant, a...
by Larry Davis
Mon Aug 11, 2014 8:36 pm
Forum: Rose Hybridizers Association Forum
Topic: Carefree Beauty Foliage Issue
Replies: 6
Views: 755

Re: Carefree Beauty Foliage Issue

I wrote an article on the spots diseases maybe last quarter in the newsletter. There are two rather similar. Neither is new. I don't remember which is which. One definitely makes holes with red/black edges. The other doesn't. But for sure this isn't BS. It has irregular margins to the spots, like ra...
by Larry Davis
Sat Aug 09, 2014 10:15 pm
Forum: Rose Hybridizers Association Forum
Topic: Cancan foliage issue
Replies: 21
Views: 2218

Re: Cancan foliage issue

A.S. has better form that CB in my opinion. Nice foliage too and equally hardy here.Both get damaged at -10 so not so super up your way. In my experience A.S. makes a good fall show, much bigger blooms in the cooler weather. Are you sure it is not a spot disease on CB? That about destroys it in PA a...
by Larry Davis
Fri Aug 08, 2014 9:59 am
Forum: Rose Hybridizers Association Forum
Topic: Could it be...RRD?
Replies: 23
Views: 1755

Re: Could it be...RRD?

I don't know enough about the virus to say what's direct and indirect. I think of crown gall, which is from a bacterial infection, but with transmission of a plasmid that is basically a naked virus which gets incorporated into the plant genome and then makes the gall grow.Hairy root is about the sam...
by Larry Davis
Thu Aug 07, 2014 11:47 pm
Forum: Rose Hybridizers Association Forum
Topic: Could it be...RRD?
Replies: 23
Views: 1755

Re: Could it be...RRD?

Red foliage is relative. For the red/pink K.O. roses, their foliage is already intensely red, so it's hard to make it appear redder. But with wild R. multiflora, the shoot tips are normally only slightly, if at all, reddish. So when you see red it means something's going on. I just returned from wes...
by Larry Davis
Wed Aug 06, 2014 9:31 pm
Forum: Rose Hybridizers Association Forum
Topic: Cancan foliage issue
Replies: 21
Views: 2218

Re: Cancan foliage issue

Some of the leaves in the background almost look like one of the spot diseases, though not going clear through with red haloes around like spot anthranose. But they usually drop leaflets before burning so badly at the edges. Any chance it is excess urea-containing fertilizer right before the drought?
by Larry Davis
Sun Jul 27, 2014 10:08 pm
Forum: Rose Hybridizers Association Forum
Topic: This appears to be part of a Thesis?
Replies: 7
Views: 1000

Re: This appears to be part of a Thesis?

Peter may have decoded this before I did. If you look at the address that shows up at the www place you'll see the prr.hec.gov.pk which is apparently their on-line library of dissertations and otehr stuff. If you go over to the .pdf, you'll see a -2 which indicates this is chapter 2. Changing that n...
by Larry Davis
Fri Jul 18, 2014 10:29 pm
Forum: Rose Hybridizers Association Forum
Topic: I gotta get me one of these!
Replies: 8
Views: 1279

Re: I gotta get me one of these!

There are a few tricks in that water use estimate. Mostly, it's the recycling. Evaporative and infiltration losses can be quite small with drip irrigation. Keeping humidity high of course reduces water demand per unit carbon dioxide fixed to biomass. But too high and you get molds growing. Also nutr...
by Larry Davis
Sun Jul 13, 2014 9:41 am
Forum: Rose Hybridizers Association Forum
Topic: Difference between roses grow from cutting
Replies: 6
Views: 1003

Re: Difference between roses grow from cutting

Riccardo, perhaps your informant was speaking generally, not just about cuttings. There is a lot of anecdotal evidence (stories) that some roses seem to run out after some years, while others are as good as they ever were. That is not unreasonable. Many perennials have a finite life span. Taking cut...
by Larry Davis
Thu Jul 10, 2014 11:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Summer Newsletter call for articles--a moving appeal
Replies: 8
Views: 1198

Re: Summer Newsletter call for articles--a moving appeal

Good luck with the trek. You'll certainly have a longer season there.
by Larry Davis
Thu Jul 10, 2014 6:08 pm
Forum: Rose Hybridizers Association Forum
Topic: Hulthemia Hybrid Fertility
Replies: 20
Views: 2248

Re: Hulthemia Hybrid Fertility

In the U.S. Euphoria is called Peachy Creeper. I've used it as a mother plant. Lots of hips. Some seedlings. Interesting colors. It does get some BS here. Good winter hardiness. I pollinated a bunch more this year. Patience.
by Larry Davis
Thu Jul 10, 2014 6:05 pm
Forum: Rose Hybridizers Association Forum
Topic: ISO thornless hardy species
Replies: 31
Views: 4817

Re: ISO thornless hardy species

Lillian Gibson is not quite so bleak. I actually found I have 2 hips out there, out of 20+ crosses. Small, like 1-2 seeds each. Patience.

Also, Pink Cloud is close to thornless on its upper branches. A few on the basals. Loaded with hips, some of which ought to be from RKO or Carefree Sunshine.
by Larry Davis
Wed Jul 09, 2014 9:39 am
Forum: Rose Hybridizers Association Forum
Topic: ISO thornless hardy species
Replies: 31
Views: 4817

Re: ISO thornless hardy species

I tried Lillian Gibson as female with Rainbow KO as pollen this year. 0/20 or so. I think it's not very OP fertile either. This doesn't mean it won't work with something, but in my experience RKO as a triploid goes onto a lot of things effectively, whether diploid or tetraploid. The same lots of pol...
by Larry Davis
Thu Jul 03, 2014 6:48 pm
Forum: Rose Hybridizers Association Forum
Topic: Optimizing for casual gardeners
Replies: 20
Views: 3255

Re: Optimizing for casual gardeners

Interesting conversation. Just one word- Cash y'all - is what drove the market for so many decades, that's how I hear Kim's comment. I agree. And now roses are a casual-T of that philosophy. BTW, Rainbow KO carries really interesting genes- remarkable "general combining ability" to use a plant breed...
by Larry Davis
Mon Jun 30, 2014 5:28 pm
Forum: Rose Hybridizers Association Forum
Topic: Chrysler Imperial thorn variability?
Replies: 6
Views: 928

Re: Chrysler Imperial thorn variability?

Personally, I would worry about rose rosette disease if I saw that many thorns of odd shape on a classic HT. With species hybrids, just par for the course.