Mason/potter wasp

6536.    Wasp holes 4 mm wide, the wasps are about 7 mm long. There are boring into 4-yr old dried untreated maple wood used fir shed posts after removing the bark, This is the first year of any wasps. I need to know what they are and if they need to be killed. Halifax, NS. Canada

Number 6536.  This does not look like a wood-boring wasp; it looks more like a mason/potter wasp (Hymenoptera: Vespidae; subfamily Eumeninae). I suspect that they are going in the holes either looking for prey or seeing if they would make suitable nesting sites.