Diatomacious Earth is used in the pool industry in some pool filters. It is crushed up fossilized plankton. It is sold in 12# and 25 # containers in my area. It is fantastic on all soft bodied bugs, slugs and caterpillars. Just put it down around the plants that you want to protect. When the critters crawl over it, the teeny tiny sharp points on the powder will open cuts on the critter and they will basically dehydrate to death. You will have to reapply after a rain though. Remember to wear a dust mask when applying this. It is very fine and is harmful if inhaled. Sometimes you can find this in small containers at the garden center but it is cheaper in the large quanities. It is 25#'s for 24.99 at the pool store where I work. Just so you will have a price reference,( no we can not ship it)
.
