The insects look like aphids. I've never seen aphids kill flower buds, so I wonder if they are the direct cause? And the rose appears to be what is known in the US as "Banshee," apparently the same as the rose grown in Sweden as 'Minette' or Rosa suionum. And if that's the case, their buds will "ball" in damp weather, rotting away as you describe, independent of the aphids.

The new book-form special issue of Rosa Mundi (journal of the Heritage Rose Foundation and available through their website) has an article on "Banshee," as well as one on old roses in Sweden which discusses this rose there.

Thank you! I couldn't locate the article you mentioned, but found another, very detailed one:

Here is a link that might be useful: article

I agree -- it looks like my own Banshee here in California that originally came from Prentiss, Maine. Apparently this rose can be found all over the world.

Rosefolly

How nice to have a post from Estonia, and a definitive resolution on the first try.

Hi Michael, I've posted here before, when I tried to ID two other roses.. I usually lurk at the landscape design forum.
My Banshee (let's call it that) has managed to open a few more blooms, looks like a good year for it - it is getting more sunlight after I removed a large lilac this spring, maybe that helps to reduce rotting.