Varroa underwoodi

Varroa underwoodi is a species of parasitic mite belonging to the order Mesostigmata and the family Varroidae. While often overshadowed by its more aggressive relative Varroa destructor, this mite represents a significant biological entity that primarily infests Apis cerana, the eastern honey bee, in various Asian regions.

The primary hosts of this mite are honey bee colonies. Its presence is mostly noted within the hive environment, specifically on developing bee larvae and adult bees. Due to its potential for host-switching, there is a global concern regarding its introduction into new geographic areas where non-native bee species are kept.

The biology and lifecycle of Varroa underwoodi are highly synchronized with the bee's development. Females enter the brood cells, lay eggs, and their offspring feed on the developing larvae. This interaction disrupts the growth cycle of the bees, leading to significant physiological stress and weakening the immune system of the emerging adults.

The damage caused by this parasite is profound, as it directly weakens the bee population and transmits associated secondary viral and bacterial infections. Infested colonies typically exhibit poor winter survival, reduced foraging activity, and high rates of adult bee mortality, which directly impacts honey production and overall colony health.

Integrated pest management (IPM) is the most effective approach for controlling this parasite. The following strategies are essential for maintaining colony health:

• Conducting regular diagnostic testing to monitor mite population density.
• Applying synthetic or organic acaricides during periods of low brood rearing.
• Utilizing physical barriers and drone brood removal as non-chemical control methods.
• Enforcing strict quarantine and movement regulations for bee colonies to prevent spread.