Spray-N-Grow makes a natural garden pesticide for killing grub worms. It is called "Grub Beater". It is safe and its contents are derived from the neem tree. It will eliminate your grub worms without harming beneficial bugs. Their website is http://www.spray-n-growgardening.com
They are EXCELLENT for a vegetable garden.
Cutworms or Tomato worms will do it. (that I know of that would be from what my grandmother warned me of when I started my first (and last) vegetable garden.)
There aren't many insects that eat garden worms. However, ants will eat garden worms that they find around the garden dead.
They are useful because worms chew your food and turn it into garden fertilizer.
The Formation of Vegetable Mould through the Action of Worms has 326 pages.
The Formation of Vegetable Mould through the Action of Worms was created in 1881-10.
worms
The formation of vegetable mould through the action of worms
can earth worms be put directly in garden
Usually you will see them.
If by 'garden snake' you meant Garter Snake (Genus Thamnophis) - then yes. Worms are part of their natural diet.
Vermicomposting means composting with worms. It is taking vegetable scraps and grass clippings and adding worms. The worms break this down and make it into great fertilizer for your garden. The only disadvantage is the time and effort to do the vermicomposting.