The interaction of dispersal and control methods for the riverine tsetse fly Glossinapalpalisgambiensis (Diptera: Glossinidae): a modelling study

Abstract

We used a spatial model of a riverine tsetse fly species Glossina palpalisgambiensis life cycle to investigate the interaction between their dispersal and three control methods and to document these interactions using sensitivity analyses. The model is currently limited to gallery forest habitat inhabited by Glossina palpalisgambiensis in the dry season in the sub‐humid zone of West Africa. The control methods modelled were traps and targets (TT), insecticide‐treated livestock (ITL), and the sterile insect technique (SIT). Both distance dispersed (up to 800 m) and percent of flies dispersing each day (up to 60 %) increased the efficiency of control by TT. Most of this increase occurred for low values of both distance dispersed and percent dispersing, but the increase continued up to the limits tried. The daily movement of cattle assisted the control program and when movement was considerable (up to 600 m daily) the effects were greater than the effects of tsetse dispersal. Random dispersal decreased aggregation and equilibrium population size, and thus also increased the efficiency of SIT. Dispersal that was mostly oriented towards clumps was of much less value for SIT but acted on TT and ITL similarly to random dispersal.

In Silico Identification of a Candidate Synthetic Peptide (Tsgf118–43) to Monitor Human Exposure to Tsetse Flies in West Africa

“…This entomological method nevertheless presents a number of important limitations, namely low sensitivities or efficiencies, as it was shown that only 20% of the traps attracted flies are actually captured [10], [11]. In addition it has been suggested that traps become less efficient when tsetse densities decrease [12] possibly due to density-dependant dispersal [13]. They may thus lead to an underestimation of the true densities.…”

Reduced dispersal and survival in the sweet potato weevil (Euscepes postfasciatus) after irradiation

“…The short dispersal distances during these seasons indicate that the weevils are likely to be clumped on plants relatively close to their release point, which results in an aggregated distribution of this species in the field (Yasuda, ). This behaviour would require careful consideration when planning an eradication programme because clumping would reduce the success of an eradication using SIT (Barclay & Vreysen, ).…”

Trapping and the Detection, Control, and Regulation of Tephritid Fruit Flies

“…They recommended that the interpretation of contours incorporate environmental variables, especially wind currents. Barclay and Vreysen (2013) used area of attraction for the riverine tsetse (Glossina palpalis gambiensis (Vanderplank)) that was equivalent to Wall and Perry's range of attraction but explicitly included dispersal, effectively converting the measure to sampling range. These authors found that trapping efficiency (percentage of the population within the area of attraction that was trapped each day) increased with dispersal distance and percent of flies dispersing each day.…”