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Researchers worry bees are facing a pandemic fueled by fungal infection passed via flower petals

Researchers worry bees are facing their own global pandemic driven by an infectious fungus that’s passed through flower petals during pollination

  • University of Colorado Boulder researchers studied bees infected with nosema
  • Nosema is a single-cell parasite that emits spores that form into a fungus
  • Different variations of the fungus have infected bees all over the world
  • Researchers worry a new novel form of the fungus could trigger a pandemic 

While humans continue to struggle with the COVID-19 pandemic, some scientists worry that bees are quietly dealing with a pandemic of their own.

Researchers from the University of Colorado Boulder have documented how bees in Europe have been afflicted with a contagious and deadly fungus that can be spread through flower petals during pollination.

Called nosema, varieties of the fungus have been documented all over the world, including South Africa, Kenya, Russia, Brazil, the United States, and Canada.

According to the researchers, exposure to the fungus is contributing to bee colony collapse across Europe and could have dire consequences for bee populations around the world.

Nosema is a type of fungus know as a microsporidia – a single-cell parasite that forms spores that combine to grow into a fungus.

When nosema infects a bee, it first ruptures the infected cells, then releases more spores that spread through the body and eventually kill the bee.

Before the bee dies, it can also excrete these spores in its feces as well as during pollination, leaving live spores on flowers where other bees can become exposed and infected.

In some areas, this has led to year-round nosema infections for beehive colonies, according to a report in the team’s findings in the University of Colorado Boulder’s news blog.

Beekeepers have helped fight the spread of nosema by breeding particular kinds of resistant bees and using plant extracts to treat bees with current infections.

In the past different types of the nosema fungus have been documented in different regions, which has contributed to the slowing the spread, but researchers worry a novel strain of the fungus could sweep across multiple regions in the world despite local resistance.

‘More work needs to be done to understand Nosema infections in native bee species and the potential consequences to native ecosystems, if native bees suffer a similar fate as honeybees when infected,’University of Colorado Boulder’s Arthur Grupe II said.


Declines in recent months to honey bee numbers and health caused global concern due to the insects’ critical role as a major pollinator.

Bee health has been closely watched in recent years as nutritional sources available to honey bees have declined and contamination from pesticides has increased.

In animal model studies, researchers have found that combined exposure to pesticide and poor nutrition decreased bee health.

Bees use sugar to fuel flights and work inside the nest, but pesticides decrease their hemolymph (‘bee blood’) sugar levels and therefore cut their energy stores.

When pesticides are combined with limited food supplies, bees lack the energy to function, causing survival rates to plummet.



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