The most common worm used for fishing is the Dendrobaena worm closely followed by the Lob worm depending on what type of fish you are trying to attract.
Dendrobaenas are used in both natural and commercial venues, to attract Tench, Chub, perch Roach and Carp. Most anglers will hook dendrobaenas straight on the hook. A good hook to use is the PR412 from Preston. Some will chop them up and mix them into groundbaits to create a choppie mix. This will then either be balled in or used in method feeders. Willy Worms supply many method feeders, from top brands such as Preston, Guru, Korum and Sensas.