Entrance reduced to ~ 25%, due to repeated assaults from Yellow Jackets (YJ). With the previous reduction, a few YJ were able to enter the hive. With this reduction, I haven't seen any entering, even though I counted 5-6 YJ near the entrance, repeatedly trying to enter.
Busy entrance in the middle of the afternoon:
A YJ trying to enter the hive:
Two YJ waiting for an opportunity:
I spotted a YJ nest in my yard (in an old tire) which I destroyed. YJ are good for the garden (preying on pests), but they have been too aggressive to the bees lately.