Southeast Massachusetts. Five hives winding down. No varroa tratment. One hive, one deep & two meds, Carni, bottom entrance partially closed, had a big bee die off a couple of weeks ago. Plenty of bees still left. Queen still has a small amount of brood in lower medium, of two. The lower deep was clean and empty, and in good condition. No damage. I took it off. Very little stores, like it was taken out. A few SHB, but coralled by bees. I killed them. Comb appears "normal". No SHB slime.
I gave them a upper entrance mid week. They use it. There is a crescent patch where they walk that is stickey and clumpy, like debis/pollen/junk from inside is getting "tracked" onto the face of the hive.
In three years I have only seen clean, clean landing spots. This is only happenning on one of five hives in the yard.
No "K wings".
What could be going on?