The concept of " utility " or " noxiousness " is a completely human concept. According to whether the activity of the beetles serves or are detrimental to the interests of the Man, those are labelled " useful " or " harmful ". What also makes that by certain sides, certain beetles are catalogued in the two categories according to cases.
This concept applies primarily within the framework of agriculture and sylviculture where the useful ones are auxiliaries of the man while having for preys other animals known as harmful (the enemies of my enemies are my friends!!!).
I will not detail here all the useful and harmful beetles, but will simply give some illustrated examples. Within the framework of these pages, there is no way of quoting all the economic interactions between the beetles and the Man.