The insect population is very greatly reduced, bees and bumble bees especially, my fruit bushes were always buzzing with them. I provide lots of flowers via the fruit and at least I am keeping them alive.
The one or two bees have been extremely busy and there are dozens of tiny apples, hundreds of gooseberries and blackcurrants and today I saw very many swelling blueberries. My autumn raspberries are already producing flowers so that will help. Its a topsy turvy world for these small vital creatures
I don`t kill any insects, they are part of the cycle of nature. Eg my roses are full of greenfly and soon the predators will come in, ladybirds, hover flies, birds, lacewings, wasps
I don`t like flies in the house though and was thinking about getting some of those door curtains made from strips. Nothing that needs to be drilled or stuck onto the frame, am thinking suckers might work
I had special fly net roller blinds on the outside of all my last windows, I could raise and lower the net, By the time I left that house, the nets were starting to deteriorate, I would not go for anything that permanent again