Preface: Before we begin: introducing mhesvi and ruzivo rwemhesvi -- How vanhu managed tsetse -- Translation into science and policy -- Knowing a fly -- How to trap a fly -- Attacking fly from within: parasitization and sterilization -- Exposing the fly to its enemies -- Cordon sanitaire: prophylactic settlement -- Traffic control: a surveillance system for unwanted passengers -- Starving the fly -- The coming of the organochlorine pesticide -- Bombing flies -- The work of ground spraying: incoming machines in vatema's hands -- DDT, pollution, and gomarara: a muted debate -- Chemoprophylactics -- Aftermaths -- A conclusion: Vatema as intellectual agents.