What is it like for insect infestations in the Northern Hemisphere?
Oh, don't I wish!! We always have lots of flies, several different kinds and sizes here, due to lots of horses and a cattle holding area to the west during the winter. Sometimes in the warm weather I kill several dozen in a single day. I use diluted rubbing alcohol in a spray bottle to kill most of them on the windows inside. I hate flies and can't rest until they are all dead.
We don't have too many other insect problems right here where I live except grasshoppers after a mild winter. I already have plenty of them in the yard and garden this year. Yellowjacket wasps nest in the darnedest places here, and I don't really like to kill them because they don't damage anything, but once in a while they just get too numerous and I start hunting nests. Carburetor cleaner does the best job...
The worst pest in my yard and garden the last two years has been field mice, voles. They have seriously damaged a lot of plantings and, so far, nothing seems to control them.