Since 2006, commercial
honeybees have been dying in massive numbers. A new study links Tobacco
ringspot virus (TRSV) as a potential cause of colony collapse disorder.
TRSV was connected
to a rising tide of bee deaths, which increase in fall and peak in the winter. The
virus is likely picked up during bees foraging and spread as the colony mixes
the pollen, saliva, and nectar to produce food for juveniles. TRSV may also be
spread by ectoparasitic Varroa mites, which feed on bee hemolymph, without
being infected themselves.
TRSV was found most
highly concentrated in the bee’s nervous system and wings, but was also found
in the hemolymph, body fat, and legs.
Tobacco ringspot is
an RNA virus. TRSV is a rapidly mutating
virus (not surprising as it is a single-stranded RNA virus), and likely spread
to bees by first adapting to soy plants from tobacco plants. The study showed that the virus can replicate and produce virions in honeybees, Apis
mellifera. Furthermore, the study showed that TRSV infected individuals were a
continual presence in several monitored colonies.
Potential ways to
prevent the spread of TRSV include increased surveillance for virus “host-shifting”
events and understanding better how plant viruses shift hosts.
Madeleine Bousquet
Reference:
1 comment:
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