One hive is completely propolising the opening on the inner cover. Why?
4th year beek in NE TN here. We had a mild-ish winter, a fitful spring, and summer has been great.
I have caucasians and know they are heavy on the propolis. The gals in this one hive and off the chain. It's the first time I've seen this behavior. The colony is 2nd year in fantastic health, requeened last spring, and the boxes are fairly new.
Every time I examine the hive (and this was before requeening) they completely covered the oval hole in the inner cover. It's a LOT of plug. I keep pulling it out so the boxes will have ventilation but they keep plugging it back up. I examine once every 10 or so days.
Any thoughts?