Just to let you all know... Permethrin, the main chemical used to spray for tick's, in a gross estimate of about 150 acres (the land that is used for the Disc Golf Course), would cost about $2500 for just the chemical application. Not including the man hours / spray equipment. The best prevention of tick's is consistant mowing of less than 4", thus why most ball golf courses never need to spray for ticks, and why it is expensive to do so. This also only gives about a 90 day residual, because of the EPA's dislike of long residual chemicals. One good application of Dursban would keep the little buggers away for years... dang the EPA for keeping us cancer free.