Debby, be aware that  a gentle colony may suddenly turn red hot.  I'm
guessing that a group of spermatozoa from a drone carrying the trait of
extreme defensiveness fertilized a bunch of eggs, resulting in a cohort of
defensive workers emerging three weeks later.  This does not require any
Africanization--I've seen it happen a few times long before the African
invasion.

I've had to move such colonies away from any habitations and requeen them.

I'm not suggesting that this is your case--just letting you know of the
possibility.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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