Search found 430 matches

by Larry Davis
Sat Oct 03, 2020 7:33 pm
Forum: Rose Hybridizers Association Forum
Topic: Seeds and RRV
Replies: 12
Views: 722

Re: Seeds and RRV

Several years ago (fall 2016) I went and deliberately harvested all the hips I could from a big bed of DKO roses badly infected with RRD. I stratified them in the usual way with 10 mM calcium nitrate, and potted up whatever seedlings were able to germinate. I never saw a sign of RRD amongst the seed...
by Larry Davis
Thu Sep 17, 2020 9:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Early freeze in Colorado! Save my hips!
Replies: 14
Views: 892

Re: Early freeze in Colorado! Save my hips!

If the stem of the cutting doesn't begin to rot in the water you are probably OK. I have had cuttings from one rose of my own that were cut for flowers, and then stuck into soil several days later to root. I had very good luck, the same as if I had cut the flower stalk after the flower dropped. this...
by Larry Davis
Wed Sep 16, 2020 2:44 pm
Forum: Rose Hybridizers Association Forum
Topic: Early freeze in Colorado! Save my hips!
Replies: 14
Views: 892

Re: Early freeze in Colorado! Save my hips!

When you put a rose into water, whatever hormones it produces are diluted into the large volume of water. That is unnatural for a rose. Better to put it into a moist , well aerated medium which could be sterile soil, vermiculite, peat moss or mixtures. Treating with a rooting hormone often helps som...
by Larry Davis
Thu Sep 10, 2020 2:57 pm
Forum: Rose Hybridizers Association Forum
Topic: Early freeze in Colorado! Save my hips!
Replies: 14
Views: 892

Re: Early freeze in Colorado! Save my hips!

Out here on the plains (eastern KS) we often have transient frosts. For radiative cooling when clouds disappear overnight, even a single bedsheet or large drop cloth of plastic will protect peppers or tomatoes if the ground was previously warm. Snow, as such, does little or no harm on roses. If you ...
by Larry Davis
Wed Aug 12, 2020 9:51 pm
Forum: Rose Hybridizers Association Forum
Topic: A sport or just quirky news...
Replies: 4
Views: 453

Re: A sport or just quirky news...

Thinking in molecular biology terms, the viruses you mention are probably not wildly transmissible viruses like Cov2, or Rose Rosette. Instead they are most likely what Barbara McClintock called jumping genes, transposable elements. Most all plants have some of these and a lot of the DNA in a plant ...
by Larry Davis
Wed Jul 08, 2020 2:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose Seed Germination
Replies: 17
Views: 2227

Re: Rose Seed Germination

I just looked up he word peroxide and came up with 222 instances back to 2003 on this forum. Maybe you could search for 2 words at once, like peroxide and germination, and eliminate some messages. I don't do searches, I just read what comes up. I'm sure here are people who could tell you how to get ...
by Larry Davis
Wed Jul 08, 2020 2:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose Seed Germination
Replies: 17
Views: 2227

Re: Rose Seed Germination

Search this forum with keywords and a discussion thread ought to show up. I'm not sure how many years back you can retrieve now. There have been some revisions in some of the software and I don't know if it changed access. Some of the electronic issues of the RHA magazine have articles on some of th...
by Larry Davis
Mon Jul 06, 2020 8:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose Seed Germination
Replies: 17
Views: 2227

Re: Rose Seed Germination

Go to the home page of RHA, find articles, then look at A century of rose seed germination. I reviewed everthing up to 2010. For more recent things, search the forum to see what people have been trying recently.
by Larry Davis
Thu Jun 25, 2020 11:28 pm
Forum: Rose Hybridizers Association Forum
Topic: Yellowing of rose leaves.
Replies: 7
Views: 1156

Re: Yellowing of rose leaves.

Cement is mostly calcium silicate plus a little calcium sulfate so that concrete is most likely the same except for sand and gravel (I looked up Portland cement on-line). Magnesium sulfate has the oxidized form of sulfur, sulfate, so if you take away the magnesium it is sulfuric acid. The final pH o...
by Larry Davis
Sat Jun 06, 2020 9:59 pm
Forum: Rose Hybridizers Association Forum
Topic: 'Commander Gillette' X "3/4 Native"
Replies: 32
Views: 3399

Re: 'Commander Gillette' X "3/4 Native"

Add mildew to some setigera. Those from David Z, at the U of MN arboretum location didn't mildew, but my line which derived from one at K-State, acquired decades ago, mildewed itself maybe to death after overwintering as rooted cuttings while the others stayed clean. I guess the same will be true of...
by Larry Davis
Sat May 30, 2020 10:16 pm
Forum: Rose Hybridizers Association Forum
Topic: first roses of the year
Replies: 29
Views: 2753

Re: first roses of the year-mini orange

Teh enter on that one is very "muddled". I see only about half a dozen definite stigmas. So it could be nearly or quite sterile as a mother. On teh otehr hand there are lots of anthers all round. If you just leave this cut rose on a sheet of waxed paper, or on a white plate, you should be able to se...
by Larry Davis
Mon May 18, 2020 9:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Yellow blend rugosa hybrid
Replies: 24
Views: 3046

Re: Yellow blend rugosa hybrid

The rose I referred to above is still holding its petals after quite a few days. The cross was Brite Eyes x Above and Beyond. It is one of the few juvenile bloomers I got out of well over 100 seedlings. I think these are real crosses because so far as I can see, Brite Eyes OP gives many more repeat ...
by Larry Davis
Mon May 18, 2020 5:55 pm
Forum: Rose Hybridizers Association Forum
Topic: Yellow blend rugosa hybrid
Replies: 24
Views: 3046

Re: Yellow blend rugosa hybrid

That fade is very interesting. I would have expected that the yellow would go and the pink would hold. That's what happens to almost every orange, apricot, gold flower that I breed. Does this stay green or drop its petals cleanly? If this one doesn't get a lot of B.S. or mildew, I'd love to try usin...
by Larry Davis
Sat May 16, 2020 10:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Yellow blend rugosa hybrid
Replies: 24
Views: 3046

Re: Yellow blend rugosa hybrid

Very good result. My problem with 13-1 is that it is not reliably winter-hardy out in the elements in our winters which rarely dip below zero. I had hoped it would do better with one parent being Orange Surprise which is ([Carefree Beauty x Rise N Shine a.k.a Pink single] x [Carefree copper= Carefre...
by Larry Davis
Mon May 11, 2020 9:44 pm
Forum: Rose Hybridizers Association Forum
Topic: using vinegar to lower soil pH
Replies: 3
Views: 624

Re: using vinegar to lower soil pH

Citrate lasts a little longer than acetate but not much. It was tried several decades ago to help plant remove heavy metals from soils, testing the theory that plant that make citric acid and excrete it into the soil are able to take up the unwanted metal better.But what happened was that there were...
by Larry Davis
Sun May 10, 2020 10:58 pm
Forum: Rose Hybridizers Association Forum
Topic: using vinegar to lower soil pH
Replies: 3
Views: 624

Re: using vinegar to lower soil pH

All I can say is that acetic acid is a perfect carbon substrate for many bacteria. So don't expect it to hang round in the soil more than a few weeks. I've grown blueberries for decades in an area with pH 8 soil. First I used a bale of peat for each plant. Later I added pounds of ferrous sulfate. Th...
by Larry Davis
Sat Mar 14, 2020 11:39 am
Forum: Rose Hybridizers Association Forum
Topic: Strat Question
Replies: 6
Views: 690

Re: Strat Question

Again, I don't think there is any clear answer. If I had a hundred seeds, I'd plant half after cleaning them out of the hips, and put the other half into vermiculite moistened with calcium nitrate and keep in the fridge until they sprout. Of course that will/might cost you a couple months of potenti...
by Larry Davis
Fri Mar 13, 2020 10:35 pm
Forum: Rose Hybridizers Association Forum
Topic: Strat Question
Replies: 6
Views: 690

Re: Strat Question

Not a silly question, just hard to answer. Generally it seems that simply storing fresh hips in a refrigerator is not enough to make them think they have been stratified. But outdoors they are not at a constant 4 C. Depending where you live, they may have gone through multiple cycles of freeze and t...
by Larry Davis
Fri Mar 13, 2020 7:32 pm
Forum: Rose Hybridizers Association Forum
Topic: Unique black spot resistance gene from 'George Vancouver' is better characterized
Replies: 19
Views: 3038

Re: Unique black spot resistance gene from 'George Vancouver' is better characterized

Really good news. I wonder where RKO got the resistance. Not apparent from its short-range family tree I suppose? The notes I have on that say RKO is the same parentage as (Radsweet) Alaska. and a half-sib to Brite Eyes. Namely Radtee x Radral. But Radral (Carefree Celebration) is Radorg x Rader whi...
by Larry Davis
Mon Mar 09, 2020 9:25 pm
Forum: Rose Hybridizers Association Forum
Topic: Germination of crosses I'm excited about
Replies: 13
Views: 1439

Re: Germination of crosses I'm excited about

Finally have flowers from some crosses with Above and Beyond, and my #1100 (similar growth habit but descended from R foetida bicolor). This at least shows that the recessive reblooming trait will pop up at a decent frequency. No count yet to get a % but it is several % at least. Best news is that I...