New paper suggests the need to periodically move bee colonies to safe environments, away from agricultural activity. Emphasizes the importance of uncontaminated food. Warns about potential interactions between chemicals and colony micro-organisms, both beneficial and harmful ones. 

Quoted for review purposes:

Present research programs are using a variety of approaches
to find the cause or combat the symptoms of CCD. The
recent honey bee decline calls for increased long term
monitoring of both infectious and
non-infectious microbial processes within honey bee colonies.

We believe that a strategy focused on how the natural
occurring microbiota contributes to colony health and
nutrition is paramount for the development of a sustainable
system.

A recent study has documented extraordinary levels of
miticides and agricultural pesticides in the bee, wax, pollen,
and beebread from honey bee colonies across the United
States

To lessen the potential for such toxic
cocktails, commercial beekeepers can provide their bees
with refugia composed of diverse and untainted pollen and
nectar sources, in essence rotating bees between toxic, semitoxic,
and non-toxic environments. As a final step, a substantial
decrease in the generalized nature of biocides
applied to the hive and pollination environment may be
needed for system sustainability.

An emerging paradigm of colony health: microbial balance
of the honey bee and hive (Apis mellifera)
K. E. Anderson, et al. Insect. Soc. 

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