Holes by sidewalk. - Ask Extension
3/8 - 1/2 inch holes appearing alongside walk.
Mounds surrounding holes.
Black / Blue non aggressive wasp like insects
hovering and entering.
...
Knowledgebase
Holes by sidewalk. #756290
Asked June 15, 2021, 7:45 AM EDT
3/8 - 1/2 inch holes appearing alongside walk.
Mounds surrounding holes.
Black / Blue non aggressive wasp like insects
hovering and entering.
Any idea ?
Prince George's County Maryland
Expert Response
Sounds like the blue mud dauber, a good guy what preys on the bad guys.
Here's a good write-up about it (though the author meant it is a predator of black widows, not a "host."): https://nwdistrict.ifas.ufl.edu/hort/2016/08/19/cool-good-bug/
You are welcome to send us a photo of the wasp, if you can, too.
Ellen
