Bees blocking hive entrance with propolis

[Vergilius]

Recently my bees have been trying (and succeeding) to block up the entrance of my National hive with propolis. The stuff is a nightmare as the bees react very aggressively when I try to scrape it out. At the moment I am getting stung ridiculous amounts every time I open the hive!
Does anyone have an idea why my bees are doing this?

 

[shonto]

Maybe they are tryong to reduce the hive entrance,
to reduce the risk of attack and make it easier to defend,

at a guesss.

shonto

 

[VEG]

If they are closing up the entrance then leave them to it, they wont totally block it.

 

[Midland Beek]

We are presuming you have by now put the entrance block in.

 

[Vergilius]

Thanks Craig,

That is just what I have been wanting to hear!