http://www.examiner.com/x-6785-Wilmington-Wellness-Examiner~y2009m6d21-6-nontoxic-tips-to-tickproof-your-yard
"In an effort to avoid Lyme disease, some still turn to chemical treatments
such as DEET to make their property less appealing to deer ticks. While the
chemical DEET is an effective tick repellent, it also contains ingredients
that can harm both people and the environment. Fortunately, there are safe,
chemical-free alternatives to DEET that can effectively discourage deer tick
infestation in your yard and limit your risk of contracting Lyme disease."
