John: I am sorry about my slow response, I was out of the office, last week planting soybeans. The most effective method of controlling moles is the use of mole traps. Moles feed on soil insects and worms. The following web page by John Church, Extension Natural Resources Educator, does a nice job explaining mole activity and how to use mole traps: http://www.urbanext.uiuc.edu/hortihints/0106a.html
I hope this answers your question.