exceeded the males on every food except cotton squares, and were also markedly 

 more prolific than those of the variety thurberiae , in which the males were 

 longer lived. The average total developmental period of weevils of both sexes in 

 both squares and bolls was about 14 days. Seven complete generations were de- 

 veloped at Tallulah between the first of June and the first of November, 1914. 



1920 - Conradi, A. F. Report of the Entomology Division. S. C. Expt. Sta. 33d Ann. 



Rpt., p. 41-43. 1919-1920, Dec. Clemson. 



The period from oviposition to the emergence of boll weevil adults averages 

 17-1/2 days. Eggs are laid about 7 days after emergence, giving a complete life 

 cycle of 25 days. 



1921 - Smith, G. D, Studies in the biology of the Mexican cotton boll weevil on short- 



staple upland, long- staple upland, and Sea Island Cottons. U. S. D. A. B. 926, 

 44 p., 1 pi., 18 fig. Apr. 19. 



A study has been made of the biology of A. grandis Boh. occurring east of 

 the Mississippi River, and the results of many tests and observations are given 

 in a series of tables; most of the investigations were made at Madison, Florida. 

 There was practically no difference in the longevity of weevils on sea- island and 

 upland cottons, nor in their developmental period, either in short- staple or long- 

 staple upland, or in sea-island cotton squares. Soil temperatures of 120°F. and 

 higher usually proved fatal to immature weevils under field conditions. 



A. grandis in this locality shows a decided tendency to form a new variety. 

 The hibernation of the weevils is incomplete, and the adults are seldom inactive 

 for more than 30 days at a time. Emergence from hibernation is very gradual, 

 the total emergence bearing a direct relation to the total daily rainfall. The total 

 percentage of hibernating weevils that survived the winter of 1918-1919 in 

 Madision, Fla. was 7.54%. 



1922 - Sanborn, C. E. Boll Weevil Life History in Connection with Essential Methods of 



Control. Okla. Agr. Expt. Sta. C. 50, 2 p. 



Briefly outlines the life history of the boll weevil and the essential cultural 

 methods for controlling this pest in Oklahoma. 



1923 - Hunter, W. D., and B. R. Coad. The boll weevil problem. U. S. D. A. Farmers' 



B. 1329:30. June. 



Origin, spread, and distribution of the boll weevil. The bulletin includes a 

 description of the weevil and its life history, notes on hibernation, and natural 

 control factors. Effective cultural and chemical control measures are described. 



1923 - Sanborn, C. E. Suggestions relative to the boll weevil. Okla. Agr. Expt. Sta. 



C. 53, 12 p., 11 fig. Stillwater. 



This paper, in part, is identical with C. 50 (1922) but gives additional infor- 

 mation concerning the weather conditions favorable and unfavorable for the 

 weevil, as well as a comparison between it and other weevils with which it may 

 be confused. 



The application of poison as advocated by the U. S. Bureau of Entomology 

 was not recommended in Oklahoma until further experiments proved this method 

 to be satisfactory under existing conditions. 



1925 - Morrill, A. W. Commercial entomology on the west coast of Mexico. J. Econ. 

 Ent. 18(5):707-716. 



The West Coast weevils appear from physical characteristics to be a mix- 

 ture of the typical Anthonomus grandis and the variety thurberiae. Ten specimens 

 collected in the Yaqui Valley in 1924 were considered to be quite typical of 

 grandis . From investigations so far made, the writer has proved the Yaqui Valley 

 weevils well adapted to extremely high temperatures and moderately low humid- 

 ity, conditions which would in all probability exterminate the typical grandis if 

 these conditions would be duplicated in our Southeastern States where the grandis 

 form exists. 



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