Honeybees may be actively spreading myrtle rust, a fungal pathogen devastating native forests, according to new research. The same foraging behavior that makes bees essential pollinators creates an unintended vector for disease transmission.
Myrtle rust, caused by Austropuccinia psidii, infects plants in the Myrtaceae family, which includes eucalypts and tea trees. The fungus produces spores that stick to bee bodies during flower visits. When bees move between plants across landscapes, they transport these spores to uninfected hosts.
Researchers tracking bee movement patterns found that foraging ranges exceed typical disease dispersal distances. Bees visiting infected flowers and then traveling kilometers to new locations create disease corridors through previously uncontaminated areas. This mechanism bypasses natural barriers that would slow fungal spread.
The discovery complicates conservation efforts in regions like Australia and New Zealand, where myrtle rust poses an existential threat to native plant communities. Infected trees suffer canopy dieback, reduced reproduction, and eventual death. Some species face extinction risk.
Current containment strategies focus on quarantine zones and direct spore removal. Adding honeybee management to this toolkit presents tensions. Bees provide pollination services worth billions annually, yet their movements may accelerate ecosystem collapse in affected regions.
Scientists recommend mapping honeybee apiaries near vulnerable plant populations and monitoring spore loads on captured bees. Some researchers propose selective hive placement to avoid high-risk areas during fungal fruiting seasons. Others suggest targeted disease-resistant plantings that exclude myrtle rust hosts where possible.
The research underscores how human management of one species creates cascading ecological consequences. Honeybees, introduced to most continents for agriculture, now unintentionally facilitate pathogen spread in ways native pollinators never could.
Management decisions require balancing