>How long would the frames from this hive remain infective, if it was CBPV
? Could I reuse the frames from the honey box next year ?

Kris,  we observe signs of CBPV at times, and sometimes it appears to cause
small epidemics in our yards.  I've confirmed by PCR and currently have
another sample in for confirmation.  In general, I strongly suspect CBPV vs
insecticide when I observe field signs for three reasons:

1.  Although CBPV can exhibit two different sorts field signs (hairless
black bees vs overall quivering of bees with high mortality), I often see
both signs in an affected colony, and

2.  These epidemics often occur during times of the year when one would not
expect anyone to be applying an insecticide (during the dormant period of
plant growth), and

3.  In my county, in which all pesticide applications must be reported to
the Ag Commissioner on a monthly basis, I am one of the major pesticide
applicators each year, due to my reporting of Apiguard (thymol) and
MiteAway (formic acid) applications.

Nearly all colonies spontaneously recover, usually quickly.  We routinely
restock bees onto combs from affected colonies after various periods of
"rest," and have not noticed any pattern of subsequent infection.

--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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