FIELD RESPONSES OF GLOSSINA-AUSTENI TO STICKY PANELS ON UNGUJA ISLAND, ZANZIBAR

Two designs of cross-shaped sticky panels (XT and XLP) were compared w ith the royal blue-white legpanel (LPBuWh) in the Jozani forest on Ung uja Island as trapping devices for male Glossina austeni. Single colou red royal blue (XTBu) and bi-coloured royal blue-white XT (XTBuWh) cau ght more than twice as many male G. austeni as the LPBuWh, whereas sin gle coloured black XT trapped significantly fewer flies (10%) than the control LPBuWh. XT's in various horizontal and diagonal blue-white co nfigurations likewise trapped more flies than the LPBuWh, except a hor izontally striped blue-white XT which trapped fivefold fewer flies tha n the LPBuWh. Cross-shaped LP in the blue-white (XLPBuWh) and black-wh ite (XLPB1Wh) combination scored significantly better than the control LPBuWh. Similar fly numbers were trapped with XTBuWh and XLPBuWh. Lon g-term trapping data indicated that the XTBu, XTBuWh and XLPBuWh were three- to fourfold more effective in trapping female flies than the LP BuWh. The landing bias on bi-coloured panels was low in the blue-white but more pronounced in the blue-black and white-black combinations an d was affected by the type of sticky panel used. A high proportion (49 %) of the flies alighted on the bottom corners of the XTBu panel, but landing positions were more scattered if white was added. Increasing t he width of the XTBu from 70 to 120 cm improved the catch by a factor of two as compared with standard sized XTBu. The effect of doubling th e height of the XT on total fly catch was negligible. At present, it i s the XTBu which can be recommended as the best trapping device for ma le and female G. austeni.