Over the years I have been having trouble with those pesky little pin hole borers chewing up my slabs that I have busted my gut to obtain.
Have tried a few methods but nothing seemed to work so rang the pest guy (which I should have done a while ago) and he suggested any chemical with Permethrin should do the trick.
So off to Bunnings and I found this product "David Grays Ant and Termite Spray" for around $12 so thought I would give it a try.
Well it's pretty potent stuff and you need to wear the correct PPE but the little buggers were scurrying everywhere and didn't last long at all.
Will keep an eye on the slabs over the next few days to see if it has done the job but impressed so far.
I know a lot of people have trouble with them so maybe this might work for you.
Cheers,
Nev