Fred,
2009 was a miserable Spring, it didn't get really warm until the middle of June. It was constantly raining and night temps were chilly, barely hitting 50 F at night. The Slugs came in droves, EVERYWHERE. It was war in the cage, believe me. I repotted everything that was in older bark, switched lots of Orchids to bare root and mounted many. ( Practically every old potting mix had a Slug or two) I also potted up a lot of Orchids into Coconut fiber, that helped a bit. No pots with a rim, Slugs hid under that.
I bought Slug pellets, it didn't help, probably since the Slugs marched right back in from the Garden. So I simply placed slices of Apples and Potatoes into strategic places and collected them in the morning. They always had a Slug or two on them and other "stuff" too. And I inspected the ground very closely and disposed of the numerous Slugs by dumping them into salt water. It was a daily fight until the weather turned warm and dry.
Kathy might remember, I lost a huge Laelia purpurata to Slugs and wetness that Spring, I still miss it.
This year I see the occasional Slug, a total of perhaps two or three, not the "daily dozen" as I did in 2009.