Here we describe field trials designed to standardize tools for the control of Glossina tachinoides, G. palpalis gambiensis and\r\nG.morsitans submorsitans in West Africa based on existing trap/target/bait technology. Blue and black biconical and\r\nmonoconical traps and 1 m2 targets were made in either phthalogen blue cotton, phthalogen blue cotton/polyester or\r\nturquoise blue polyester/viscose (all with a peak reflectance between 450ââ?¬â??480 nm) and a black polyester. Because targets\r\nwere covered in adhesive film, they proved to be significantly better trapping devices than either of the two trap types for\r\nall three species (up to 14 times more for G. tachinoides, 10 times more for G. palpalis gambiensis, and 6.5 times for G.\r\nmorsitans submorsitans). The relative performance of the devices in the three blue cloths tested was the same when\r\nunbaited or baited with a mixture of phenols, 1-octen-3-ol and acetone. Since insecticide-impregnated devices act via\r\ncontact with flies, we enumerated which device (traps or targets) served as the best object for flies to land on by also\r\ncovering the cloth parts of traps with adhesive film. Despite the fact that the biconical trap proved to be the best landing\r\ndevice for the three species, the difference over the target (20ââ?¬â??30%) was not significant. This experiment also allowed an\r\nestimation of trap efficiency, i.e. the proportion of flies landing on a trap that are caught in its cage. A low overall efficiency\r\nof the biconical or monoconical traps of between 11ââ?¬â??24% was recorded for all three species. These results show that targets\r\ncan be used as practical devices for population suppression of the three species studied. Biconical traps can be used for\r\npopulation monitoring, but a correction factor of 5ââ?¬â??10 fold needs to be applied to captures to compensate for the poor\r\ntrapping efficiency of this device for the three species.
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