These underground creatures endemic to the Pacific Northwest can create problems for those who desire an attractive lawn and shrubbery.
Those piles of dirt on top of your lawn are a result of a mole doing one of two things: creating a feeding runway, or cleaning one out. The food source for a mole is primarily Earthworms. They travel down the runways looking for Earthworms trapped or dangling into the runway. ‘Looking’ is a bit of a misnomer as they can only sense light and dark. Feel and smell are the senses that direct them to food. As they need to consume quite a number every day to survive, they move fairly rapidly thus the need to continually clear the runway. ‘Grubs’ (such as crane fly larvae) are not a primary food source for moles as they are too shallow and not present much of the year. Therefore, Wolbert’s will never apply anything that will eliminate Earthworms, larvae, or grub population as a method to control moles.
Besides the obvious choking of grass under the mound, the runways can also aerify grass and plant roots thus killing them.
Often damage is caused by one mole as they have no love lost for each other. For a brief period early in the year they mate, but after that they are generally solitary animals. After breeding, gestation and some nurturing for the young (a single litter is four to five) they are sent packing to find their own way in life. Often this creates a flurry of activity in landscapes around May as the babies are making homes.
There are many advertised home remedies for eliminating these pesky creatures from your landscape. Many of these amount to snake oil. Poison and trapping are two of the more effective ways to rid yourself of the problem.
Good luck and good hunting.