Jerry writes:

Now, things that I do know from our data that are associated with
supercedure:

 1) Use of chemicals to drive bees from honey supers
 2) Addition of lots of empty supers during a nectar flow
 3) Environmental stressors  - lack of space, over-heating, agri- and
 industrial chemicals inside the hive (volatiles in the air inside the hive)
 and (this is a guess, the others are based on data - mite density).

Do these increase or decrease supercedure? How much?

pb