Is this citrus gall wasp?

[Beano]

This is a topiary tree in the front yard of my rental property. I think it might be a citrus. The main give away is that I think it has gall wasp. Do these infect any other kind of tree?

[FlashDG]

Yes it is. You need to cut it off and bin it. and yes it will spread to other citrus trees.
We have Grapefruit, 2 types of mandarins, limes and lemons here in the yard and we are forever cutting it out of the grapefruit and lemons.

[Sammy D]

No point cutting them off now. They are gone. See all the holes. They have left. Cut any new lumps off as they will have already layed a new lot in your citrus ready to hatch this spring.

[Beano]

Does it only infect citrus? Any other kind of tree? This tree is covered in this, there's almost not a single branch not affected, yet the tree appears very healthy.

[shibui]

I can only find reference to them using citrus and it appears, not all citrus species. Interweb posts tell me this is a native wasp that usually lives on our native fingerlimes in Qld and NSW but with all the yummy citrus trees we have planted has now spread all over the country.