Sometimes fertilizer that has (or possibly has) living micro organisms will be referred to as "bugs in a jug" by superintendents who are skeptical.... in other words they don't believe in the stuff. When you look closely at the labels of these special fertilizers they will include nitrogen and iron and billions of live organisms. When applied, one can not be sure if the living organisms are still alive or doing anything in the soil and for the plant. I would probably include myself in this group of skeptics most of the time.
When the bugs in the jug are really bugs you can see, how can you argue?
My wife bought some lady bugs to eat the aphids that were eating our apple tree in the backyard.
I guess all the environmental talks we have had are paying off.