Which of the following diseases is NOT a vector of Varroa mites?

Varroa Mite Syndrome is not classified as a disease that acts as a vector for Varroa mites because it is a condition that arises specifically due to the presence of Varroa mites in a beehive. This syndrome results from the negative impacts that these parasites have on honeybee health, including weakening the bees and making them more susceptible to various infections.

In contrast, the other options are associated with diseases that can be transmitted through the action of Varroa mites, which can act as vectors for these pathogens. For instance, the Deformed Wing Virus and Chronic Bee Paralysis can be spread among bee populations residing in infested hives, as Varroa mites can carry and transmit these viruses from one bee to another. These diseases are related to how mites impact the overall health of bee colonies, but Varroa Mite Syndrome specifically describes the health challenges faced due to the mites themselves, rather than another germ or pathogen transmitted through their bites.

Thus, the selection of Varroa Mite Syndrome highlights a distinction between diseases caused by the infestation versus those that are spread by the infestation.