pyralis Dyar, a Phalaenid which bores into bolls. The boll weevil passes the dry 

 season between crops in old cotton fields. Reproduction apparently ceases during 

 this time. Early infestations in young cotton were heaviest in fields planted before 

 the usual date. Peak infestations occurred when the crop was approaching 

 maturity. The life cycle is similar to that in the United States. Sacadodes also 

 was generally a late- season pest, and was particularly serious in late-planted 

 fields. Infestations of both insects were reduced by means of insecticides, but 

 increases in yield were small. 



SURVEYS 



1908 - Hunter, W. D. Boll weevil scarcer. Tex. Stockman & Farmer 26(27):7. June 17. 

 Results of the first boll weevil status examination made by agents for the 

 Bureau of Entomology during 1908. 



1926 - Anonymous. Outstanding entomological features in the United States for Novem- 

 ber and December 1925 and January 1926. Insect Pest Surv. B. 6(1):24. Mar. 1. 

 Wash. 



A summary is given of reports received from various States outlining the 

 conditions with regard to the more important insect pests, with a view to assisting 

 workers to plan their programs for the coming spring and summer. The pests 

 dealt with include Anthonomus grandis. 



1931 - Grossman, E. F. Methods for making counts of boll weevil infestation. Fla. 

 Agr. Expt. Sta. B. 241, 22p. 



A survey of half an acre of a field of cotton, in which all squares on all 

 plants were examined, indicated that the greater the number of squares examined, 

 the more closely the estimated percentage of infestation by Anthonomus grandis 

 Boh. approaches the actual degree of infestation in lightly infested fields. Heavily 

 infested fields, however, require the examination of relatively few squares. Of 

 the various methods of determining the degree of infestation, that of making 

 estimates from 20 plants at random is as satisfactory as any other and involves 

 comparatively little labor. The determination of the number of boll weevils in a 

 sparsely populated field is attended with great errors, regardless of the method 

 employed. 



1933 - Gaines, J. C. Reliability of differences between data obtained in cotton insect 

 investigations. J. Econ. Ent. 26(1 ):274-279. 



The results indicate that the mean difference between the point and survey 

 methods used in estimating infestation by the boll weevil is not significant. 



The point system consisted of examining 100 squares at 36 different points. 

 This was a point to every 29 acres. 



The survey method consisted of examining from 25 to 50 squares at 378 

 points while working through the cuts in a somewhat circling course. This was 

 one point to about every 2 acres. The data for both systems was taken from a 

 1,034-acre field on the same day. 



LOSSES CAUSED BY THE BOLL WEEVIL 



1904 - North, S. N. D. Quantity of cotton ginned in the United States (crops of 1899 to 



1903, inclusive). U. S. Dept. Com. and Labor, Bur. Census B. 10:9, 15-17. 

 Statement regarding distribution and loss due to the boll weevil. 



1905 - Sanderson, E. D. The boll weevil and cotton crop of Texas. Tex. Dept. Agr. 



28 p., 7 pi. Austin. 



The author reviews previous estimates which have been made since 1894 of 

 the amount of damage done by the boll weevil. 



173 



