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Observations on the free larval stage of Glossina morsitans morsitans Westw. (Diptera, Glossinidae): the possibility of a larval pheromone

Published online by Cambridge University Press:  10 July 2009

T. A. M. Nash ,
M. A. Trewern  and
S. K. Moloo
T. A. M. Nash
Affiliation:
Tsetse Research Laboratory, University of Bristol, School of Veterinary Science, Langford, Bristol BS18 7DU, England
M. A. Trewern
Affiliation:
Tsetse Research Laboratory, University of Bristol, School of Veterinary Science, Langford, Bristol BS18 7DU, England
S. K. Moloo
Affiliation:
Tsetse Research Laboratory, University of Bristol, School of Veterinary Science, Langford, Bristol BS18 7DU, England
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Abstract

Under simulated natural conditions the anal orifice of the larva of Glossina morsitans morsitans Westw. appears to open either at or soon after parturition. The larva burrows on average within two minutes of deposition; pupariation is completed 10–15 min later. Using methods that prevent burrowing and prolong the crawling period, certain larval movements were related to the pre-pupariation anal discharges and to the rapid spread of the fluid. Although the anus is not generally thought to be connected with the hind gut during the whole of larval life, the presence of uric acid in the discharges indicates that the fluid is a product of Malpighian tubule excretion. In a two-choice chamber in an incubator, flies larviposited significantly more often in the experimental pot if it contained a water- or ether-soluble extract of larval excretion in addition to any pupariating larvae. This points to the presence of a larval phero-mone which may attract gravid females to a breeding site.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 66 , Issue 1 , March 1976 , pp. 17 - 24
Copyright
Copyright © Cambridge University Press 1976

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