I can't find anything on GW or on the web that speaks to whether or not these are beneficial.

===>>> perhaps bass ackwards???

in the alternative.. what if any damage do you see ...

if none.. then ignore them ..

it is not important if they are 'beneficial' ... i would call them neutral ...

i would also look for pet poop.. dead things.. etc ... and if you do.. you will find what is attracting them ...

ken

May I ask where you saw information regarding lacewings and the control of green bottle flies?

They are beneficial in the grand scheme of life in that they help 'recyle' animal poop, dead things, garbage, and rotting fruits and veggies. It is the maggots that do that job. However, they are not something that you should encourage in your own little part of the world.

As Ken says: you need to find out where they are coming from and eliminate the source. One year, we had a lot of them come to our back patio whenever we would grill. THAT didn't go over too well. A little bit of sleuthing led us to the discovery that our neighbors were not cleaning up after their two large dogs. (Their son was supposed to do it.) Once the doody duty started again, the flies disappeared.