I know it has its detractors, but I've had great sucess with Nemaslug.
If the ground is kept moist for the specified period following application it works a treat. ;) I've not had a single slug munched spud this year... The shaws were being devoured early in the season and I was expecting devestation below ground, but all has been good, so far. Caterpillars are another matter. ::)
