It's a really good question if you are a new beekeeper, and sometimes a not so easy one to answer if you are experienced!
The trick really is to try to read the hive and establish what is going on, then react accordingly. It could be there are several or many ways to manage the issue for it may not be a problem. But it might. So here's a really handy booklet produced by the Welsh Government on what to do .... It's an easy read with lots of pointers.
Well 10.00am 16th April and the temperature is only 5 degrees so I'm not opening up yet! That was how I began the last blog, this time I'm saying