Further Observations on the Extermination of Glossina palpalis fuscipes Newstead by Hand-catching

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Abstract
A block of a mile and a half of riverine forest on the Kuja River was separated from other riverine bush by clearings of 2 and 3 miles. Clearing costs are recorded.An attempt was made to exterminate G. palpalis in the block by hand-catching. This failed, because the clearings did not exclude immigrant G. palpalis.More G. palpalis could be caught from boats on the river than from paths beside the river.Two attempts were made to prevent G. palpalis from crossing the clearings :—(a) by stretching hessian screens treated with DDT right across the river.(b) by placing large numbers of DDT treated “ trap-screens ” in the clearings. Neither had a decisive effect.No evidence was found to indicate that hand-catching would not work in a completely isolated block, but it appears to be quite impracticable to isolate a block of G. palpalis bush on a permanent river.

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