Asian Giant Hornet

A species of the Asian Giant Hornet (AGH) (Vespa mandarinia) was reported and verified in Washington state in December 2019.  This was the first known introduction of this insect into the United States.  Currently, the AGH does not exist in Texas, however it is important for beekeepers and the public to be aware of this pest.

The AGH is considered to be a pest to honey bees since it is capable of destroying an entire colony in a matter of hours.  The hornets seek out the developing larvae, but will attack and decapitate adult honey bees in order to feed on the larvae.  These hornets do not typically attack people or other animals, but will do so if they are threatened.

Vespa mandarinia specimen Photo credit: Xanthe Shirley USDA-APHIS-PPQ

Vespa mandarinia specimen with size comparison Photo credit: Xanthe Shirley USDA-APHIS-PPQ

 

Texas A&M AgriLife Research and AgriLife Extension have developed some outreach materials that provide more information about this insect.  If you suspect that you have spotted the AGH, please submit any photos via the Department of Entomology Insect ID form or submit specimens using these collection instructions.

Informational Resources

 

For Beekeepers

How to Detect

There are several ways a beekeeper can keep an eye out for these insects.  One way is to watch for foraging hornets, which are most active during the day from spring to autumn, depending on the climate.  These foragers will hover or “hawk” outside honey bee colonies to catch any foraging bees leaving or returning to the hive, or guard bees that are attempting to defend the colony.  If a foraging hornet catches a bee it will drop to the ground with the bee before it paralyzes and decapitates it.   The hornets may enter a honey bee colony to steal the developing brood.  If so, the hornets will attack the guard bees first before stealing from the brood nest.  Beekeepers in France have experienced losses of entire colonies due to the Asian hornet (Vespa velutina), and have noticed that these hornets typically attack hives that are already weak due to another cause.

How to tell if a honey bee colony has been attacked by the Asian Giant Hornet

You most likely will not see the AGH themselves, however the most distinguishing characteristic of an attack on a honey bee colony is to find a pile of dead adult bees, most of them decapitated, on the ground outside of the hive.  If you suspect that your hives have been attacked by the AGH, please contact the Texas Apiary Inspection Service immediately (979-845-9713, tais@tamu.edu).

 

 

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