Description: Segment 1 The narrator explains that tsetse flies pose a serious threat to humans and animals, who can become infected by blood parasites through tsetse fly bites. Cattle are seen being treated by chemotherapy. Light aircraft are seen spraying insecticide. Various traps have been designed to catch flies and either kill them or sterilise them. Uninfected flies are bred in the UK and sent to Africa to be used in tests. Time start: 00:00:00:00 Time end: 00:07:38:13 Length: 00:07:38:13 Segment 2 An example of an odour trap is shown. Flies are attracted by animal smell and are caught. Once caught, they can be sterilised by chemicals or treated with insect juvenile hormones. Once a female has been treated with juvenile hormone, any offspring she produces will die. A graph shows the effects on the tsetse fly population of the various methods. The most effective however, remains spraying from the air. Time start: 00:07:38:13 Time end: 00:15:35:06 Length: 00:07:56:18