Been studying a bit of info. Last year I had several hives that didn't do squat. right next to hives that did great. everything seemed fine, good patterns of brood, no mite issues etc. So in studying a bit (thanks randy oliver) thinking now that my field force was not living long enough to allow the hive to grow. according to some hive growth caclulators, workers need to do fields duty for about 16 days.....

So that brings me to my question, anybody have any idea how to determine how long you field bees are living?? tho only thing I can think of is dusting them with spray paint during orintation flights...... and that seems like it might effect the results......