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Laboratory evaluation of bisazir as a practical chemosterilant for the control of tsetse, Glossina spp. (Diptera: Glossinidae)

Published online by Cambridge University Press:  10 July 2009

P. A. Langley  and
D. A. Carlson
P. A. Langley
Affiliation:
ODA/University of Bristol, Tsetse Research Laboratory, Langford, Bristol, BS18 7D U, UK
D. A. Carlson
Affiliation:
USDA, ARS, Insects Affecting Man and Animals Laboratory, Gainesville, Florida 32604, USA*
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Abstract

The sensitivity of males and females of Glossina morsitans morsitans Westwood to the vapour phase of bisazir was tested in the laboratory in a moving air stream at temperatures ranging from 12 to 20°C. Similar tests were conducted in still air in closed systems. Bisazir was used in its granular form or absorbed onto silicone rubber or cellulose fibre surfaces from solution in dichloromethane. As a crystalline solid, it lost only 5% of its weight in a moving air stream over 12 days. However, even in relatively still air, bisazir absorbed onto cellulose fibre discs lost 70% of its weight at 20°C and 80% at 30°C in 24 days. Estimations of the amounts of bisazir present on a surface by weight difference were higher than those estimated by gas chromatographic analysis. Hence, in addition to being volatile, bisazir must be regarded as somewhat unstable. Nevertheless, sufficient active ingredient remained over a long enough period for it to be considered as a practical means of sterilizing tsetse in the field. Females were found more sensitive to bisazir than males, but exposure times required to produce total sterility in both sexes did not affect survival. Exposure times of only a few minutes were sufficient to induce a significant reduction in female fecundity or male fertility at 30–35°C, temperatures which might be expected under field conditions in a device to sterilize automatically tsetse attracted to traps in the field. The degree of sterility induced was permanent, and at these short exposure times the temperature had no effect on female fecundity.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 76 , Issue 4 , December 1986 , pp. 583 - 592
Copyright
Copyright © Cambridge University Press 1986

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