One year I had my farm balanced with beneficial insects.
There were no flies, (and we had horses), mosquitoes, thrips, aphids, gnats, etc.
I was soooo happy!
I had spent lots of money on beneficial nematodes, preying mantis, etc.
Then along came one of those hurricanes and blew all my good stuff away
and all the bad stuff in.
I've never bothered to get so balanced again.
(But I try to be as organic as possible...making plants stronger with soil mineralization helps prevent many pests and diseases.)