Breeding for resistance was already an old concept by 1937:
> Claims regarding resistance have recurred so persistently that they can no longer be ignored. Either there is truth in these claims or there is not. The matter is too vitally important to the beekeeping industry to permit a continuation of the present status of uncertainty, with no attempt to clarify the situation. If resistant bees exist, we cannot begin too soon to propagate them; if they do not, the sooner we find it out, the better.
Park, O. W. "Testing for resistance to American foulbrood in honeybees." Journal of Economic Entomology 30.3 (1937): 504-512.
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