Figures 15.1


A tsetse fly, Glossina morsitans (Diptera: Glossinidae), at the commencement of feeding (a) and fully engorged with blood (b).
Figures 15.1. A tsetse fly, Glossina morsitans (Diptera: Glossinidae), at the commencement of feeding (a) and fully engorged with blood (b).

Note that the tracheae are visible through the abdominal cuticle in (b). (After Burton & Burton 1975)

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  Schematic graphs of the fluctuations of theoretical insect populations in relation to their general equilibrium population (GEP), economic threshold (ET), and economic injury level (EIL).