1921 - Coad, B. R., and R. W. Moreland. Dispersion of the boll weevil in 1920. 

 U„ S. D„ A. C. 163, 2 p. Jan. 



During 1920 the movement of the boll weevil was retarded in the eastern 

 portion of the cotton belt, but a large portion of territory has been reinfested 

 in Oklahoma and Texas. Altogether 42,621 square miles of new territory was 

 invaded in 1920, and only 752 square miles were freed, this occurring in 

 Tennessee. Only about 72,000 sq. miles of cotton producing territory remained 

 uninfested. The extent of infestation in each State is briefly dealt with. Con- 

 sidering the cotton producing States as a whole, an average of only 16.2% of the 

 total cotton crop is produced in uninfested territory. 



1921 - McDonald, R. E., and M. C. Tanquary. Report on the pink boll worm situation 



in Mexico. Tex. Dept. Agr. Mo. News B. 3(5):6-7. Feb. and Mar. Austin. 



This report was made as the result of a visit, from November 26 to 

 December 1, 1920, to the Laguna region of Mexico. Certain limited areas in 

 Texas and Louisiana are now infested with Platyedra gossypiella, and this infesta- 

 tion came from Mexico. 



Other cotton pests include the cotton boll weevil which appears to have been 

 present for 25 years or more, but does not do much injury, probably owing to the 

 arid climate. 



1922 - Coad, B. R., E. S. Tucker, W. B. Williams, F. F. Bondy, and R. C. Gaines. 



Dispersion of the boll weevil in 1921. U. S. D. A. C. 210. 



The cotton boll weevil has now reached the limit of cotton cultivation in the 

 United States, except in Western Texas, Southwestern Oklahoma, Northeastern 

 North Carolina, and Virginia. The situation in the various States is briefly out- 

 lined. In all 66,662 square miles of new territory were invaded by the weevil in 

 1921, making a total of 600,771 squares miles. About 105,000 square miles of 

 cotton territory are still uninfested. A map shows the spread of the weevil from 

 1892 to 1921. Tables record the movement of the pest in 1921 by States and the 

 proportion of the cotton crops of each State produced in uninfested land. Only 

 5.4% of the crop from the cotton belt originated from uninfested land. 



1923 - Anonymous. Entomological notes. U. S. D. A. Ybk, 1922: p. 31. 



The cotton boll weevil is now found in all the cotton growing States. Calcium 

 arsenate dust properly applied is very beneficial. It is not possible as yet, 

 however, to reduce the cost of this treatment to a point where it will be profitable 

 on land producing less than half a bale of cotton to the acre. It is hoped that 

 aeroplanes may prove to be of practical use in distributing this poison. Losses 

 caused by the boll weevil for the years 1909-1921 are recorded on p. 714. 



1923 - Anonymous. Reported occurrence of the boll weevil in the Northern Territory. 

 Queensland Agr. J. 20(2):101, Aug. Brisbane. 



The recent report of boll weevil from cotton fields in the Northern Territory 

 is erroneous and apparently referred to Platyedra gossypiella (pink bollworm). 

 According to a report of H. Tryon, the latter definitely exists in the Northern 

 Territory, in view of which he suggests the isolation of this region with respect 

 to cotton from the remainder of Australia. 



1923 - Bondy, F. F., R. C. Gaines, W. B. Williams, and M. T. Young. Dispersion of 

 the boll weevil in 1922. U. S„ D. A. C. 266, 6 p., 1 fig., 2 t., Wash. 



In 1922, 22,386 square miles of new territory were invaded by the cotton boll 

 weevil, the greatest increase in infestation being in North Carolina with 16,363 

 square miles. In Texas and Oklahoma the infested area decreased by 8,944 

 square miles, thus leaving a net increase of 13,442 square miles for the cotton 

 belt. Only 4% of the cotton crop is now produced outside weevil- infested 

 territory. 



1923 - Kelly, E. G. Note on the cotton boll weevil in Kansas. J. Econ. Ent. 16(6):552. 



A number of adults and larvae of the cotton boll weevil were found on cotton 

 in southern Kansas (Montgomery County) in Oct. 1923. 



169 



