1914 - Hunter, Wo D. Ent. Soc. Wash. Proc. l6(l):27-28. 



Remarks by the author on cotton growing in semi-arid and arid sections with 

 reference to A. grandis and A. grandis thurberiae . 



1928 - Isely, Dwight. The relation of leaf color and leaf size to boll weevil infestations. 

 J. Econ. Ent. 21 (4):553-559. 



Field experiments in 1925 and 1926 indicate that the boll weevil has marked 

 preference for cotton plants with green foliage to those of red foliage. It ap- 

 parently has little preference for small, as compared to large, leafed varieties, 

 providing the size and vigor of the plants are about the same. 



1935 - Fenton, F. A., and E. Hixson. Effect of the 1934 drought upon the boll weevil in 

 Oklahoma. J. Econ. Ent. 28(5):760-765. 



In 1934 a severe drought so effectively checked an early boll weevil infesta- 

 tion that practically no damage was done to cotton by this pest. Due to extremely 

 high temperatures the weevil was almost exterminated in fallen squares. It was 

 able to survive, however, in fairly large numbers in cotton bolls which were not 

 affected by the heat. The broods of weevils emerging from bolls late in the sum- 

 mer produced a large supplementary fall generation in late squares which were 

 developed in unusually large numbers by the plants due to heavy rains in Septem- 

 ber and November. Because of late frost this large supplementary brood went 

 into hibernation in good condition. 



1937 - Hixson, E., and C. A. Scooter. Temperatures at which boll weevils freeze. J. 

 Econ. Ent. 30(6):833-836. 



The boll weevil was much more resistant to cold than was formerly sup- 

 posed. The undercooling temperatures of 991 boll weevils show a range from 

 26.6° to 9.4°F. Those undercooled in November and February were the most re- 

 sistant, while those undercooled in December and March were the least resistant. 

 Winters having low minimum temperatures were followed by small field popula- 

 tions of hibernating weevils, whether the population the previous fall was large 

 or small. 



1939 - Hixson, E. Okla. Sta. (Bien.) Rpt. 1937-38. 



A brief report on resistance studies of boll weevils to relatively low tem- 

 peratures. 



1942 - Gaines, J. C. Several important insect pests of cotton - 1. Relation of produc- 



tion to migration. 2. Insecticidal studies for their control. Iowa State Col. J. 

 Sci. 17(l):63-65. 



Work conducted over a period of years in the Brazos River bottoms near 

 College Station, Tex. with the boll weevil, cotton fleahopper, bollworm, and 

 flower thrips. 



1943 - Hamner, A. L. The effect of boll weevil infestation. Miss. Farm Res. 6(6):4-5, 



4 illus. 



Cotton plants react to the loss of squares punctured by the boll weevil by 

 setting a higher percentage of the younger bolls and by producing heavier bolls. 



1943 - Hamner, A. L. The effect of boll weevil infestation at different levels on cotton 

 yield. Miss. Agr. Expt. Sta. B. 389, 10 p. 



The cotton plant reacts to the loss of squares of the size punctured by the 

 boll weevil by setting a higher percentage of the young buds and by producing 

 heavier bolls. 



The percentage of young bolls that matured was higher on plants that had as 

 few as 10% of the squares removed throughout the season than on untreated 

 checks. This percentage increased from week to week as the percentages of 



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