Looks like a mint beetle. Devastating to mint. Chrysolina menthastri.
Beautiful colour.
* i stand corrected. I have never seen the rose chafer before. Same sort of iridescent colour and shape as the mint one. I will keep. My eye out for that beasty.
I used to get them all over my cherry tree every spring. They turned the leaves to lace and ate all the flower buds.
Tree too big to spray, even if I wanted to go down the chemical route. Got rid of them by hanging up bird feeders nearby, never been troubled by them since.
There is a small weeping cherry in the back garden, where I let it go. I have been pretty successful in persuading birds into the back garden so I'm not too worried at the moment, although I'll keep an eye open for damage. Thanks for the heads up.
The main problem I've had in the past with roses is the rose sawfly larva. As most of my roses are in pot, I can move them near the bird feeders and table if necessary.
Thanks to everyone that responded to my question. I've learnt something new this evening.
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Cetonia aurata https://en.m.wikipedia.org/wiki/Cetonia_aurata
Beautiful colour.
* i stand corrected. I have never seen the rose chafer before. Same sort of iridescent colour and shape as the mint one. I will keep. My eye out for that beasty.