In my garden there are all sorts of "beasties", some of them good, many of them not. Here are some photos of them.
All the creatures in the photos above are "above-ground" ones, but I find that the worst enemies are the "below-ground" ones; the ones you can't see until it is too late. You usually only become aware of them when your plants wilt and die. I have had this problem recently with some of my bean plants. One day they look perfectly healthy, and the next they are dead. When I dig them up I find underground a squishy stem riddled with small creamy-white maggots. I had thought these were the larvae of the Vine Weeveil, but having looked at several pictures of Vine Weevil larvae on the internet I don't think they are. They look a lot like cabbage root fly grubs. Do Cabbage Root flies attack beans as well? Why would they do that when there are plenty of nice brassicas in my garden? I had this problem last year - except much more severely. I had to sow three lots of beans before I was able to get a viable set of plants. My remedy has been to apply Vine Weevil nematodes, and this year the problem has not been so acute, but maybe that is just down to luck - especially if the things are not Vine Weevils.