I don't remember our having had a discussion about nematodes for pest control. I have used them for a number of years to control whatever insects eat holes in my vegetable root crops. Last year I began trying them for control of cucumber beetles. There I neglected to control the adults adequately and lost most plants to bacterial wilt. Nematodes are also supposed to help with flea beetles and any other insect that spends part of its life underground. And they are not supposed to be harmful to earthworms. So it occurs to me that they might be useful against insects whose larvae burrow into bulbs and tubers. Has anyone tried this? Note: they are also advertised as being effective against fungus gnat larvae. I'll be interested in hearing what our collective experience with these tiny critters is. Dell, in SE Pennsylvania, zone 6/7