XA9951561 FAO/IAEA Int. Conf. on Area-Wide F-IV Control of Insect Pests, Penang, May 28 to June 2, 1998 INTEGRATION OF STERILE INSECT TECHNIQUE (SIT) AND AUTOSTERILISATION LETHALITY IN ERADICATION OF GLOSSINA FUSCIPES FUSCIPES NEWST. (DIPTERA, GLOSSINTOAE) IN BUVUMA ISLANDS IN LAKE VICTORIA, UGANDA. F. P. Oloo1, P. A. Langley2, F. Luyimbazi3 and L. M. Ogwal3. 'Ministry of Agriculture, Veterinary Department, Nairobi, Kenya 2University of Wales, Cardiff, U.K. SMinistry of Agriculture, Animal Industry and Fisheries, Entebbe, Uganda The control of tsetse fly, G. f.fuscipes Newst. on Buvuma island, on lake Victoria, in Uganda is of great importance to Eastern and Central Africa due to its role in transmitting human and animal trypanosomosis. The results of trapping, though promising, do not go far enough in achieving the island wide suppression of the fly in a short time due to logistical and technical problems. Where Sterile Insect Technique is to be integrated into a control programme using the insecticide based tools like impregnated traps, they must be removed first because.the released flies intended to cause eradication will also be killed. The main objective of this trial was to evaluate the effectiveness of an Insect Growth Regulator (IGR), Triflumuron, Bayer, in reducing tsetse population. Triflumuron sterilises the female tsetse which can also pass the hormone to the male flies by contact especially during mating. A recent study based on mark release recapture on the island showed that 70% of the tsetse population is found along the lake shore whether they were released at the water edge or in the hinterland. Thus concentrating the control measures along the lake shore and water edge would drastically reduce the entire tsetse population on the island. Results on tsetse species studies suggest that killing or sterilising both sexes is always superior to sterilising and releasing males only and leaving the females unharmed. Use of chemosterilant, like triflumuron, in simple effective low cost tsetse suppression technology is non-polluting and environmentally acceptable. Relatively low rates of reproduction and low population densities suggest that tsetse are suitable candidates for control by sterilisation. The trial assesses the effectiveness of triflumuron with a view to integrating its use with sterile insect technique in tsetse control programmes. -47-.