In certain types of daisies, there is a chemical known as pyrethrum that repels many insects. These two types of daisies, the Persian Daisy and the Dalmation Daisy, have been used for centuries to deter mites, ticks, fleas, aphids, even lice. As long as the plant is not ingested, it is a very safe, environmentally-friendly and effective insecticide. In fact, many commercial insecticides contain pyrethrin, which is derived from daisies containing pyrethrum.Commercial brands, unfortunately, have changed the chemical make-up of pyrethrum and added other chemicals to their products, making them not-so-desirable around pets and children.

For further reading, see my sources
http://garden.lovetoknow.com/wiki/Pyrethrum
http://www.livingwithbugs.com/permethrin_pyrethrum.html
http://en.wikipedia.org/wiki/Pyrethrum
http://progressivegardening.com/gardenpestcontrol.html
Mother nature is pretty amazing isn't she!
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