The Juvenile Hormone Analogue W-328 Affects Adult Development and Emergence in the Tsetse Fly, Glossina fuscipes fuscipes (Diptera: Glossinidae)

Syprine A. Otieno, Nicholas O. Oguge, Rajinder K. Saini

Abstract


The tsetse fly Glossina fuscipes fuscipes Newstead (Diptera: Glossinidae) transmits protozoan parasites of the genus Trypanosoma, which cause human trypanosomosis. The disease leads to morbidity and eventually mortality if not treated. Biological compounds such as the juvenile hormone mimics methoprene, precocene and pyriproxifen have been shown to disrupt reproduction and development in some species of tsetse flies. There is need to identify other such compounds that may be used in control programmes. This study evaluated the effects of the juvenile hormone (JH) analogue W-328 on reproduction, development and emergence in Glossina fuscipes fuscipes. Topical treatment of adult female flies with the juvenile hormone analogue W-328, ranging from 0.001 to 100 mg showed no effects on number of larvae deposited, pupariation and pupal weight. However, adult emergence was inhibited in most pupae. Physical examination of the pharate adults showed that tergites were unclerotized in about 67.4 % (n= 181) of the flies. The analogue also interfered with pigmentation of the abdominal integument, mid-dorsum of the thorax and eyes. Treatment of puparia of varying ages with the analogues inhibited emergence only in puparia less than five days old. Those aged five days and above showed high emergence rates irrespective of dose of analogue used. The results indicate that the analogue may be used to inhibit development of G. f. fuscipes.


Keywords


Glossina fuscipes fuscipes; juvenile hormone analogue; W-328; reproduction; development; emergence.

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References


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