Fórum Rose Hybridizers Association

At about the end of June I scarred about 200-300 open pollinated HT achenes in a mixture of 3% hydrogen peroxide in a 1/3 cup of water (soapless mixture A of Don’s guide) for about 12 hours and I sowed them outdoors in seed trays. The temperature did fluctuate between an average of minimums of 3-7C (there were few days that reached 0-3C) and daily highs of 15-21C. About 70 days later I now have 30 seedlings and more are still coming up. I’m quite happy with the results, the germination rate is currently somewhere between 10-15%. If I get any more hips which are open pollinated I’ll test them in summer conditions.

Love that cross as well! I checked but none of them are available here to my knowledge, odd that I can’t find Nymphenburg as LR works close with Kordes and the majority of their catalogue comes from them. Very jealous about Trier, the white and yellow roses are my favourite.

Regardless of the extents, it is not an RMV pattern that is depicted in that photo.

Hmm, reminds me of one of Barney Gardner’s seedlings, Fallen Snow, we referred to that as “R. Kudzuii” as it began growing and never stopped.

Here she is, super leggy and loving to spread horizontally. Been spotless all season though. Maybe seeing some signs of mildew as the weather cools down, which is kind of a bummer .

Thank you! I’m hoping it adds more petals and form next year. (AND that its siblings bloom!) Pink is my least-favourite colour, but pale blush, or scorchingly-hot pinks can be acceptable. Is ‘Prairie Princess’ available where you’re at? It is found behind many useful & fertile breeders in N. America. Another modern tetraploid, Kordes’ ‘Nymphenburg’ has proven useful to me as a pollen parent, but I’ve had no luck growing its seeds. ‘Trier’ and ‘Mutabilis’ are both diploid, but yield pink flowers readily, and doubles. Here’s an OP seedling of ‘Mutabilis’ that germinated in 2024 for me, and I’m utterly charmed by:

I like the shade of pink that it is and the white centre is lovely. I’m currently looking for a nice pink rose for hybridising and if I saw that at a nursery I’d buy it!

I definitely have a few roses that only give off one or two chlorotic leaflets a year. I think it’s more common in hotter climates where there’s a smaller temperature window for RMV symptoms.

The variegation in the first photo does NOT resemble RMV, nor would that generally show on only a single leaf on a plant. It is almost certainly a chlorophyll-deficient chimera. It’s possible that growth from the buds at the base of that leaf would also express the characteristic, but that kind of variegation can be rather unstable. I agree that the other photos show leaf senescence, which could either be normal or stress-induced. Stefan

Sorry, no. It would have been 35mm slides taken over 20 years ago. I had to reduce the number of plants and concentrated on those happiest to be where I was.

Do you have any pictures of it?

Here in the U.S. you can generally assume that any grafted rose bought at a store is infected with multiple viruses, but that’s in big part due to the pervasiveness of virused Dr. Huey rootstocks. I would imagine that in places where they grow their rootstocks from seed like in Europe the viral situation is different, albeit still an issue due heritability and mass propagation. One issue that makes things harder to diagnose is the interplay between mosaic viruses and fungal diseases. Viruses probably make foliage more prone to fungal issues that cause yellowing, and fungal issues probably have the potential to weaken a rose enough to exacerbate viral symptoms. Heavy emphasis on the word probably here. There are a lot of variables in presentation, viruses, climate, cultivar, and plenty of other unknown factors. That said, the variegation in the first pic sure looks a lot like RMV to me. And whenever chlorosis originates from the veins of a leaf it should be treated with some degree of suspicion.