We have a serious grub problem, which is causing a serious mole problem. And in the summber, it becomes a serious japanese beetle problem (they were ferocious last summer with my shrubs). I don't think I want to apply a general "critter killer" because many of the critters living down below are good for the lawn (earthworms, etc?). I've read about using nematodes as a control, but don't know where to purchase them or how to determine how much of them to use. Could anyone tell me where to look for these, and the proper use? Or suggest anything else that won't kill every critter, just the bad ones. Someone told us that lime helps control grubs, but I haven't found any supporting documentation on it...is this true? Thanks.