The Mystery of the Snapped Rosebuds

Hello and happy Sunday to you all!

On the 27th May I discovered that over 15 buds had broken off on my Wildeve rose. The buds have not been eaten, they just develop these little dark horizontal marks on the stem, fold over and then fall off. It must have happened within one or two days. I discovered one more bud with black marks yesterday, 3rd June.
Other than that, Wildeve looks healthy and happy.

Has anyone ever seen this before? And and does it have anything to do with the tips of very young rose shoots turning brown or looking nibbled off (last 2 photos)?
I would be grateful for any insight

 

That's weird.

 

Hello, thank you for your reply @wiseowl.

Wow, that is so interesting, abscission! And you are right, the stems are red or yellow, I hadn’t realised that.

My thoughts are that possibly Wildeve didn’t have enough nutrients or energy to support all her buds. She had over 30 and now she has about 20. She is in a container and she probably does not have access to enough nutrients to support all those buds.
Some of my other older roses - by that I mean roses that have been in containers for around three years - are currently experiencing yellowing of the leaves and I have been given some very helpful advice that this is caused most likely by nutrient deficiency. What caused e.g. my Gertrude Jekyll climber to have yellowish leaves might have caused Wildeve to drop a third of her buds.
I have fed all my roses recently with a liquid feed high in nitrogen which will hopefully make them feel happier.

Have a nice evening