I was going to post this in the Equipment Section...
I've been thinking about going to migratory lids for the hives and have some concerns about upper entrances and shb. I am currently using screened bottom boards and have yet to see a beetle anywhere but the top of the hives. When I use a solid bottom board they are everywhere and I have lost every solid bottom hive to shb in the past year (6 so far). Other than nuc's I am all screened now. I lost one hive three weeks ago that was screened bottom board and am setting traps in the last three hives and trap out.
To the point or question is; I have a trapout with a nuc right now that I used window screen to cover the feeder/vent(?) hole in the inner cover. I have experimented with feeding and it doesn't SEEM to hinder access to a jar. Since I prop my lids for ventilation, unless it's a top entrance hive, do you think the screen will be enough to keep the SHB from accessing the hive that way? Or do you think they may still squeeze in?
As an aside to your question I would be doing something about the shb rather than lose all those hives and effort. At least put traps in and manage their numbers