@GhostOnTheHalfShell I believe a good deal of this is self-inflicted, due to mixing of a lot of commercial hives (esp. on almonds in California) -- superspreader event. Plus most commercial keepers really don't care about their bees. We see them take hives and leave farms mid-day, which is absolutely the wrong thing to do (half the bees or more are out foraging). You have to wait until night when they are home.