Hi John
I wrote short article for Scottish Beekeeper making the point that all these claims for breeding resistance have been made before in the 1930's
Resistant queens were on sale then as well
At that time the most famous beekeepers of the time were convinced that foulbroud resistance could be bred in and eliminate the disease.
One of the cornerstones was the belief that the hygenic gene for brood removal was the key to success.
Les Bailey's book I mentioned is around 1969 or so about 40 years on and he explains why the project failed
It might be better to think of these traits as switches i.e. on or off not as continuously variable like a volume control
You might remember "Spinal Tap" where they thought they made their amps louder by painting a number 11 on the volume controls
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