From:
Rothenbuhler, Walter C. 1980. Necessary links in the chain of honey
bee stock improvement. American Bee Journal March 1980, p 224:

"The level of resistance to American foulbrood was dramatically
increased by selective breeding (reviewed by Rothenbuhler, 1957; Cale
and Rothenbuhler, 1975).  Colonies of resistant stock, developed by
selection, have taken an inoculation of 1000 scales of AFB in the
middle of their broodnest without showing recognizable new symptoms
of disease.  Furthermore, the scales were removed from the
inoculation comb and healthy brood reared immediately.  Highly
susceptible bees were tested simultaneously with the resistant ones
to constitute a controlled experiment and they became heavily
diseased."

References were:

Rothenbuhler, W.C. 1957. diploid male tissue as new evidence on sex
determination in honey bees. Journal of heridity 48:160-168.

(I think that is not the right reference; rather, I'd go for:
Rothenbuhler, W.C. 1958. Genetics and breeding of the honey bee.
Annual Review of Entomology 3:161-180.)

Cale, G.H. Jr. and W.C. Rothenbuhler. 1975. Genetics and breeding of
the honey bee, p. 157-184. In Dadant and Sons (Ed.) The Hive and the
Honey Bee. Dadant and Sons, Hamilton, Illinois.


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