Several tribes of bark beetles are also major forest pests, and they farm their fungus gardens as their only source of food by growing the crop inside the sapwood of dead or dying trees.
But the leaf-cutter ants are the modern pioneers, and their farming techniques are the most sophisticated of all, according to Schultz and Brady. They involve three separate but mutually dependent organisms that must all work together: The ants that eat leaves, grasses and flowers; the fungus that grows in the ant gardens; and a unique bacterium that lives and grows on the skin of the ants for mutual support.

interesting.