I started tidying up my flowerbeds yesterday and discovered alot of grubs - i think they are leatherjackets - in the soil. Some of my plants are struggling and look a little under attack. Im guessing that they have been eating away at their roots.

To give an idea of how many there are, if you took a double handful of soil from the beds, you would probably have a grub in it, perhaps two.

How do i get rid of them? I can use a chemical pesticide if needs be, but the only one i am aware of is one that you apply on lawns in the autum to kill them before they become grubs.

thanks

Thanks for the replies.
They are definately not vine weevil grubs.
They look like this:
Google Image Result for http://upload.wikimedia.org/wikipedia/commons/3/32/Tipula_leatherjacket_Emelt.jpg
So i guess they are leatherjacket grubs.