We have two hives, one healthy and one not so.
Yesterday we noticed that the front left corner of the landing board on our healthy hive had black stuff on it. It looked like the sooty mold that grows under trees that are infested with aphids.
When we pulled the sticky board from that hive (we're treating for mites), the hive trash on the front left corner of the board was all black too. This is dry black stuff, not wet and sticky.
We've been seeing alot of hive beetles (killed about 20 in this hive a couple weeks ago), but there were no larvae on the sticky board (the sticky board in the weak hive was literally crawling with SHB larvae. Those larvae are now all dead.)
If there is a SHB outbreak in the healthy hive, could it cause this black stuff?
We're reluctant to tear the hive apart to look. The girls seem to have it how they want it for the winter (which is generally mild).