>One could assume it's an African bee, almost all
honeybees kept in Brazil have African origins.

One reason you see beekeepers in Brazil able to handle bees with AHB
genetics is because most have a strict schedule of requeening with European
queens. One told me last week he felt if he goes to requeening twice a year
with European queens all his hives he will solve most of the aggression
problems. He now requeens all the hives with European queens  once a year.
In short commercial beekeepers in Brazil have been flooding the area with
European queens now for 49 years on a regular basis. They have been
depopulating aggressive hives and removing the genetics from the gene pool.
Steve Tabor said do nothing about AHB and the problem will solve itself in
thirty years. Sorry Steve! The hypothesis made sense back in the 50's with
the knowledge available then but not today.
The method Brazil beekeepers  use today IS the best solution. If they were
not seeing results then they would have dropped the constant requeening and
removing aggressive hives method years ago.
*If* you can keep pure African genetics below a certain percent you get a
workable AHB. The problem is and always has been that in areas of African
genetics with supercedure and AHB drones in the area a few hives will begin
to carry over 50% AHB in F2 -F4 generations.
*IMPORTANT*
AHB can get to the F4 or F5 level in weeks (unlike our European bees) due
simply to swarming every couple weeks and supercedure.
Everything Steve Tabor said about wrote about AHB *genetics* forty years ago
is true today. The constant requeening of AHB hives with European stock IS
the reason why you see pictures of bees which can be worked easily in
Brazil. Taming AHB is not realistic by selective breeding between *pure*
scutellata  for the average beekeeper.
HOWEVER
With instrumental insemination a hybrid (similar to Midnight/Starline) could
be created. DNA testing would also need to be used in order to keep the AHB
donor source at a certain percent AHB level( 25%/50% or 75% ) although some
might disagree.
YOU could not use a queen with a percent AHB as she would be producing
drones with AHB . You would have to use a drone to introduce the AHB
genetics in my opinion.Otherwise you would see AHB genetics increase in your
bees and you would be producing AHB drones. PURE EUROPEAN QUEENS PRODUCE
EUROPEAN DRONES.
I think I have got the above correct after years of research.
Bob
Ps. Ask a simple question from Bob Harrison and above is what you get.

"beekeeping is both simple & complicated at the same time"

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