No it's not rose rosette virus, that can be discounted.
Nollie,... no I've not seen that before on any of my roses but I have heard about this happening, and what has occurred there is that two canes have fused together to form a flattened cane, which has fasciated at a leaf node... this sort of thing which is rare, can be caused by abnormal weather patterns or a variety of other reasons, including insect or mites, chemicals, or bacterial infection.. it could even be simply a genetic inherited disorder. Anyone's guess...
Nothing to worry about, I would just remove the cane when flowering is finished..
Thanks, it is quite fascinating, fasciation or no! It definitely is half leaf half petal. I have certainly been having very abnormal weather patterns, so perhaps that is the cause. I will do as you suggest Marlorena. Not too worried about as as the plant seems very healthy and robust.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
I have exactly the same thing happening with my delphiniums too. Planted last year they were fine, this year I have a mix of normal flower spikes and some as above.
Apparently the plant is not affected in following years.
Life's tragedy is that we get old too soon and wise too late.
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Nollie,... no I've not seen that before on any of my roses but I have heard about this happening, and what has occurred there is that two canes have fused together to form a flattened cane, which has fasciated at a leaf node... this sort of thing which is rare, can be caused by abnormal weather patterns or a variety of other reasons, including insect or mites, chemicals, or bacterial infection.. it could even be simply a genetic inherited disorder. Anyone's guess...
Nothing to worry about, I would just remove the cane when flowering is finished..
Apparently the plant is not affected in following years.