Washington, D.C. 
v 
October 20, 1922 
IMPOUNDING WATER IN A BAYOU TO CONTROL 
BREEDING OF MALARIA MOSQUITOES. 
By D. L. Van DInes,* 
Entomologist, Investigations of Insects Affecting the Health of Man, Bureau 
of Hntomology. 
HELE CUIO Nie aie ey eS 
Topography and formation of the 
CONTENTS. 
Maintenance work following clear- 
ing and construction 
RECOM Week ewe Perret sey Tet Tee 2 | Survey of Anopheles breeding after 
Favorable conditions for mosquito im pounding? £1. 2 34 2 
BeveO pment. oo 3 | Fishes in the impounded area__-__ 
Location of cultivated lands, road- Factors preventing mosquito breed- 
ways, and dwellings .._.____=-» = 3 ing in the impounded water___-_ 
Problem of Anopheles control in Leakages caused by crawfish and 
CUES Sele 24710) | ee Soe ae oe a 4 means of preventing them_--__-~- 
Bayou Walnut and the Anopheles Advantages of impounding, apart 
SOLS Ea pag oe etal a ita Seen 4 from prevention of Anopheles 
fishes ot the) Trevtion=—. eas 10 brecd ities ee ee 
@leariss the. bayou ——~=~———.--— TD ohks Soong eee a car ee ae 
Construction of the dam___-_-__---~- 12 i 
INTRODUCTION. 
Page. 
Malaria is responsible for important losses in returns from agri- 
cultural crops in the Delta region of the lower Mississippi Valley. 
The disease is, as well, a great handicap to the further development 
and extension of agriculture in that region. The prevailing system 
of labor in the Delta is that of the negro tenant farmer, and it 1s 
among this class that the disease is highly prevalent, causing losses 
ease nese eee eo 
1 Resigned May 15, 1922. The writer wishes to acknowledge his indebtedness to George 
S. Yerger, owner of Hecla plantation, for his interest and cooperation in the work; to 
Alexander Clark, manager of Hecla plantation, for the supervision of the work of clearing 
_ the bayou and the construction of the cross levee and spillway of the dam; to Haw Kirk- 
_ patrick for the photographic work in connection with the project; to Dr. R. E. Coker, 
Dr, A. F. Shira, and F. M. Barnes of the U. S. Bureau of Fisheries for the cooperative 
work on fishes; to the U. S. Bureau of Plant Industry for the plant determinations; to 
the U. S. Geological Survey for the topographical maps of the region; and to H. H. 
Kimball, A. H. Jennings, E. Foster, and F. H. O’Neill, formerly of this bureau, for 
assistance in the survey work, 
