Peter said:
Even here, it is very easy to dissect a larva in the field to check the
colour of the gut (EFB shows a white gut full of bacteria).

While I agree that a white gut is a sure sign of a *problem* a white gut of
a bee with nosema would be hard to tell apart in my opinion which is the
reason I see little value in the above method except to give a general idea
of a gut  problem.

Most EFB I find is easily seen (as pointed out by Peter Edwards) in the
larva stage as opposed to the pupa stage as with AFB.

I look for EFB first in the larva of the colony and not the gut of the bee.

Bob

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