16 



NATURAL CO^^TKOL OF THE COTTON BOLL WEEVIL. 



Through the dispersion movements during the fall of 1904 weevils 

 spread over a large area in western Louisiana, as shown on the accom- 

 panying map (fig. 1). 



By a large number of very careful field examinations between 

 May 1 and August 1, 1905, ^Ir. Wilmon Newell, entomologist of the 

 Louisiana State crop pest commission, with the assistance of Messrs. 



R K A N 5 A 



L(6)y0SQAKlA 



LEGEMD 



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/>fLL /aoj-M/G^/^r/o/^ o/p A/?r/r/c/^i sp^£r/io. 



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— — — jf/VJ/'/T/?// A/A/f/r or /A^r£sr/j7/OA/ , ^yc/iy 3/^ /905_ 



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Fig. 1.— Map of Louisiana, showing dispersion movements of 1903 and 1904 and reduction of infested 

 area, by winter conditions of 1904-1905. 



E. S. Hardy, J. B. Garrett, W. O. Martin, and C. W. Fljmn, working 

 in cooperation with the boll wee^^l investigation of the Bureau of 

 Entomology, was able to determine that the weevils had been prac- 

 tically, if not completely, exterminated in that portion of the 1904- 

 infested area lying east of the heavy line shown in the map, running 

 from the southwestern corner of Caddo Parish, throudi about the 



