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[Gene GeRue <genegerue AT ruralize.com>]

> Since moles feed on the grubs that feed on the lawn, and since the
> predominant grub is the Japanese beetle larvae, once you reduce the
> number of beetles, you reduce the number of larvae and over time, the
> moles move on to turf that has more grubs.

"The diet of a mole consists of earthworms, snails, slugs, and 
insects (both adult and larval stages), but also may include small 
amounts of vegetation and seeds taken inadvertently."

The quote is from:
http://www.ext.vt.edu/pubs/wildlife/420-201/420-201.html

Heartwood has more moles than necessary to maintain an ecological 
presence and avoid extinction. I do not care to eliminate earthworms 
from my lawns and garden areas. Thus far my mole control efforts have 
been puny, putting hardware cloth or gravel/stones/broken glass at 
the bottom of a new raised garden bed. If I could know that our moles 
feed mostly on insect larvae I would try the Milky Spore method of control.