Beneficial nematodes , they come on a sponge you set in water then put in a sprayer. You can also use diotomaceous earth around the base of the plant. It cuts the worms. You can get both at most grange supply stores. You can also rake the soil around your plants if it will not disturb the roots and you can pick the worms up as they are disturbed . Keep your garden clean and always use nematode a through out the season.