Yesterday was the hottest and most humid day of the summer, and the bees were feeling it big time.
That’s the bees in one of my hives bearding outside the hive. (The Star Trek symbol is used as a distinctive homing marker for the bees. It probably doesn’t make any difference to them, but too bad.) The photo was taken around 7:30am this morning. They were bearding twice as much last night. It was about 30°C (86°F) when I went to bed around 10:30pm.
From what Rusty Burlew tells me, bearding is a behaviour that’s triggered by excessive heat or humidity, which is made worse by over-crowding and a lack of ventilation inside the hive. The bees leave the hive because it’s cooler outside. You can read more about bearding at Honey Bee Suite.
The hive already has a screened inner cover and a ventilation rim to help with ventilation, but it looks like it could use a screened bottom board too. I’m building one today and hope to have it installed soon. My foundationless hive has a screened bottom board and it looked like this at the same time Hive #1 was bearding this morning.
March 2019 Postscript: For the casual joe just poking around the internet for neat looking beekeeping photos, the ones in this post might not seem like much, but as a guy who’s been experimenting with beehives for almost ten years now, I’m intrigued by my early-beekeeping powers of observation, especially when they uncover things like this. I haven’t messed around with screened bottom boards for two or three years now. My homemade ones were left outside one winter and rotted into mush and I haven’t used them since. But now I’m wondering if I should try them again. The photos in this post and others I’ve uploaded show a significant difference between hives that have screened bottom boards and ones that don’t. I’m thinking I might get a small mirror that I can place in front of a bottom hive entrance and if the mirror fogs up, then it might be a sign that the hive could use a screened bottom board, or least some extra ventilation of some sort. Interesting.