Milt,
Around my neck of the woods (Vermont), slugs always indicate high moisture
levels. Three possibilites jumped to mind:
1) Is it possible that this hive is located somewhere too damp?
2) Is there excessive vegetation around the hive keeping it damp?
3) Have you tried elevating the hive a bit, to get it away from the damp
ground?
It would seem that anywhere that slugs are happy, bees would not be.
Just thinking aloud.
Todd.
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