Editing Tsetse fly (section)

====Land clearing====
Another early technique involved [[land clearing|complete removal of brush and woody vegetation from an area]].<ref name="Willett-1963" /> However, the technique was not widely used and has been abandoned.{{cn|date=November 2021}} Tsetse tend to rest on the trunks of trees so removing woody vegetation made the area inhospitable to the flies. Until about 1959 this was done by hand and so was quite time consuming. Glover et al 1959 describes the technique which they call "[[chain clearing]]". Chain clearing drags a chain forward between two heavy vehicles and thereby does the same job much more quickly - but still at some expense.<ref name="Willett-1963">{{cite journal | last=Willett | first=K. C. | title=Trypanosomiasis and the Tsetse Fly Problem in Africa | journal=[[Annual Review of Entomology]] | publisher=[[Annual Reviews (publisher)|Annual Reviews]] | volume=8 | issue=1 | pages=197–214 | year=1963 | issn=0066-4170 | doi=10.1146/annurev.en.08.010163.001213 | pmid=14000804 }}</ref> Preventing regrowth of woody vegetation requires continuous clearing efforts which is even more expensive,<ref name="Willett-1963" /> and only practical where large human populations are present. Also, the clearing of woody vegetation has come to be seen as an environmental problem more than a benefit.{{cn|date=November 2021}}