Lavender beetles - on Rosemary bush

[stayathomedad]

Love (and freq use) our Rosemary bush for BBQ/cooking but full of 'cuckoo spit' which when you look closely has a green bug inside it, and is laid by a very shiny small black beetle about the size of a ladybird, but with petrol green and blue and yellow flashy colours (in the sunlight). American friends child proclaimed them lavender Beatles; how do I get rid of the buggers American friends tiled proclaimed them lavender Beatles; how do I get rid of the buggers and leave the rosemary edible for us? Plus we have cat so petsafe suggestions pls

Errr should be full stop after 'buggers' and 'American'

And 'tiled' is of course 'child'
Gee thnx Siri ...

First thing is to patrol the plants regularly, and get the green swine off! My partner squirts the foam with diluted vinegar. I just scoop it off and squish the bug on the ground. I check the patio every couple days for them. I don't know what the vinegar is meant to achieve.