Three people have asked me this question in the past week, so it must be wireworm season. First off, although we're told that there are no good or bad insects, there are plenty we could do without in the garden and wireworms are one of them. Wireworms aren't really worms. They are yet another insect's larval stage that lives in the soil and feeds on plant roots. The adults, click beetles, don't do much damage themselves, but the kids can wreak havoc on vegetable gardens. They particularly love potatoes and corn.
My favorite control for wireworms is to till them up to the surface and wait for the birds to come and take them away. It's a bit macabre, I suppose, but it does the job. Here's the skinny on wireworms.
Photo: Photo: David Bradbeer / flickr.