http://www.durgan.org/URL/?FHACH 27 May 2007 Diatomaceous earth, This was purchased today at a Seed and Feed Supplier. Cost 13 dollars for 25 pounds.
Wear a mask when dispensing. Ingesting into the lungs has dangers, similar to many types of dust.
This is a non toxic pesticide. http://eap.mcgill.ca/publications/eap4.htm Attribute URL
Probably the most effective naturally occurring protective powder is diatomaceous earth. This is a geological deposit made up of the fossilized skeletons and tests of siliceous marine and fresh water organisms, particularly diatoms and other algae. These skeletons are made of hydrated amorphous silica or opal. When crushed, they break up into tiny pieces of glass” (so tiny that the material feels like talcum powder). This is easily picked up by the hairy bodies of most Insects. whereupon it scratches through their protective wax layers; and they also absorb some of this material. the result being that the insects lose water rapidly . dry up and die Further protection is provided by the powder’s property of repelling many insects. A similar principle probably accounts for the fact that birds frequently take dust baths, presumably to rid themselves of parasites.