Abstract
Upwind flight was elicited in tsetse, G. morsitans exposed to host odor and to active components of host odor (CO2, acetone and 1-octen-3-ol) in a wind tunnel. With the exception of octenol the odors also produce marked kinetic effects in G. morsitans, G. austeni, G. pallidipes and G. palpalis. Threshold concentrations for G. morsitans are in the region of 0.2% for ox odor 0.01% for CO2 and 400 .mu.gl-1 for acetone.

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