Probably the only way to prevent vine weavil damage in the first place is to water the compost with a chemical, Provado Vine Weavil Killer. Nematodes only become useful when the vine weavil grubs are already active in the compost.

Not easily.Eggs can also be killed by watering with armillotox at intervals......see helpful instructions at armillotox website. This product smells of tar but is used in a weak dilution. Hope u find this helpful. This product is also very effective as path cleanser if you do it in a dry period and in the evening.

As above but try to use John Innes soil-based composts as the weevils find it more difficult to penetrate this compost rather than the softer peat-based ones.

If it is a single stemmed plant (like say a standard Fuchsia) then one way is to cut a circle of plastic the size of the interior of the pot. Make a hole for the stem (only just big enough, so no soil is showing at the base of the stem) Slit the plastic from the edge to that hole and place round the stem and on the soil. Might be worth making a few tiny holes for watering. Cover with bark or grit.
Vine weevils need to be able to reach the soil near to the stem of the plant to lay their eggs. If they cannot do so then they go else where.
Grit will work if it is at least 2 inches deep, again because she cannot find the soil.

I used to have problems with weevils until I stopped using peat based compost.

thanks for the replies ,,im sure one will work,i put a sign up saying no wevils,,,,,but it seems they cant read