Leatherjackets???

Hi everyone,

Last night while out on my slug check I found dozens of crane flys sat upright on my lawn and I have no idea what they were doing.
The photo is of one I removed. I’m assuming I have a pending leather jacket invasion? Should I treat with nematodes now or wait a little?

 

Did you get some rain.
Just wondering if they were actually emerging.

 

That does look more like the crane flies were emerging rather than laying eggs.