According to our scale hives, at mid-day in the middle of summer in Mt and in CA, you will have as much as 10-15 pounds of bees outside of the hive. We always questioned the accuracy of frame counts to grade bees, if done mid-day, but even we were startled by the number of bees outside of a strong hive in the early afternoon. FYI - that's 4500-5000 bees per pound.
So yes, you miss fumigating a LOT of bees and any mites hitching a ride.
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