>
> I used to confuse EFB and PMS frequently. For me the thing that did the
> trick was looking at the color of the dying larvae. Larvae dying from EFB
> show different colors, like a weird greenish grey, whereas PMS/virus deaths
> are more white.


A quick mite count is usually easier. High mite counts with EFB/PMS
symptoms = high probability of PMS over EFB.

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