Varroa Behavior
About Varroa Mites
Varroa Destructor
The Leading Cause of Colony Loss
Varroa destructor is widely considered the most serious threat facing modern honey bees.
These tiny parasitic mites reproduce inside capped brood cells, feed on developing bees, and spread multiple debilitating viruses throughout the colony. Left unmanaged, mite populations can grow rapidly and lead to colony collapse.
Varroa is not a “maybe” problem. It is a management issue that every beekeeper must understand.
(more below and in the linked pages)
Checking for Mites
Treating for Mites
Breeding for Resistance
Tropilaelaps Mites
Introduction
Why Varroa Matters
Varroa mites weaken bees in two primary ways:
- They reproduce inside capped brood cells, increasing their population alongside the bees.
- They transmit viruses such as Deformed Wing Virus (DWV), which can spread silently through the colony.
- They shorten the lifespan of worker bees, especially those raised late in the season.
- They contribute to winter losses when fall mite levels are too high.
A colony may appear strong on the outside while mite levels are quietly rising inside.
By the time mites are visibly seen crawling on bees, the infestation is often severe.
You Cannot Manage What You Do Not Measure
Visual inspection alone is unreliable. Mites spend very little time on the backs of bees and are rarely seen unless numbers are already high.
Responsible management starts with monitoring.
Testing provides the data needed to make responsible treatment decisions.
Understanding the Full Picture
Managing Varroa effectively requires understanding:
- How mites reproduce and spread inside a colony
- How to accurately measure mite levels
- When intervention is necessary
- What treatment options are available
- How selective breeding may improve long-term resistance
Use the pages below to explore each topic in more detail:
