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Sat, 6 Nov 2010 07:34:04 -0600 |
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> > What was interesting was that the most prolific hive was the first to
show AFB this year. (Bob will comment, I am sure).
> Not sure why the most prolific was the first. Weaker hives usually display
> the AFB but the strong hives rob the weak. I have never seen AFB patterns.
Well, assuming these bees were all hygienic to various degrees, I am
thinking the more hygienic ones were burdened by pulling more brood and the
ones which showed some AFB were less picky about what brood they kept. I
don't know that there was much, if any robbing.
This observation was not the result of particularly careful investigation or
necessarily representative. The hive I am remembering was a monster that
was ready to swarm early and one that I split multiple times subsequently.
The hive only showed a few cells before I decided it was time to use the
treatment option.
People say that using OTC or tylosin merely mask AFB. I'm thinking that
hygienic bees do the same if there is a background level of spores in the
hive or environment.
BTW, Beaverlodge is working on three aspects of AFB management by bees: HYG,
nurse bee spore filtering and larval resistance to infection. Steve Pernal
gave a great presentation at the ABC meeting this week. They are
investigating effectiveness, heritability, interrelation, and markers for
the traits.
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