I lost a nuc a week ago bees crawling everywhere on the ground, the whole hive died. Today I was outside an my three big hives all have bees crawing out and thousands of dead. It has been very humid here since March. Things have never really dried out. The hives smell a little like rot, but I believe that is mainly because of thousands of bees outside the hive. It is adult bees that are dieing so I don't think it is foul brood. Maybe pestisides? There is no mold or algee or anything funky in the hives. I think it might be too late, but I hope not. First year raising bees and I don't want it to end like this.
Can anyone point me toward what I should check/do??