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" ... DLF: Interestingly, there does seem to be a correlation between recent occurrence of CCD and the presence of residues of Varroa control chemicals. In these situations, hives with lower rates of CCD generally have higher varroacide residue levels. This suggests that beekeepers who are more vigilant in controlling Varroa are less likely to have CCD in their colonies. Varroa mites weaken bees’ immune systems and are themselves vectors of pathogens that may cause severe sickness in bees and trigger the CCD response. While I believe existing data suggest this hypothesis is true, more experiments need to be run in order to definitively test it. ... "