Ambrosia beetles are a group of unrelated scolytine weevil clades defined by a shared ecological strategy: fungus farming. Most bark and ambrosia beetles (the two weevil subfamilies Scolytinae and Platypodinae) are somehow associated with fungi. The relationship varies from association with phytopathogens, through enrichment of herbivorous diet with fungal mycelia, to strict mycetophagy. Ambrosia beetles are the vaguely defined end of this spectrum, the beetles which, instead of eating tree tissues as their ancestors, carry around symbiotic fungi, inoculate them into the trees they colonize, and are dependent on fungi as their main source of food.