I hope they aren't out yet up at our farm. I sprayed and sprayed last year. Seemed worse on the south side of the barn, but they were everywhere.
I'm really hoping that some of the spraying I did last fall, and this spring will keep their numbers down this fall.
They were active from about now, until late spring.

9 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (going away), SMB, and HSB (only one seen in 5 yrs) Restocked HSB (2020) Have seen one of these.
I think that's about all I should put in my little pond.
Otter attack in 2023