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Preliminary trials of 12 models of the pyramid trap were carried out in the Congo on Glossina palpalis palpalis (Robineau-Desvoidy) using Latin square designs. The models were compared with the standard trap with which they differed either in the shape of the pyramid, the addition of a royal blue cloth skirt, or the pattern of the blue-black screen. A decrease in height and/or volume of the pyramid significantly reduced the capture rate. The standard tetrahedral pyramid was significantly superior to both the regular tetrahedral and the trihedral pyramid. The addition of a royal blue cotton skirt modified both the attractiveness and effectiveness of the trap. However, although the attractiveness was probably increased, the skirt may have deterred the flies from entering the pyramid; the best results were obtained with the largest openings. The modification of the blue-black screen pattern may be a way to increase the attraction of flies to the trap. Although no model was found to be significantly superior to the standard, certain gave interesting results which should be investigated further. |
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