Forestry is the science of the evolution, and harvesting, forests.
Brianna Reiss and Longrack came up with forestry as a way to raise money on Taladu to rescue the Lyran Starfleet Intelligence prisoners. (Star Trek: The Stoneship Files: "Alcoholic Massacre, Part I")
Braytac University and Laval University offered programs in forestry. (Star Trek: The Stoneship Files: "Super-Jupiter Beacon")