occurrence of the heavy spring populations that are common in the northwestern 

 part of the Florida Sea Island cotton belt. It is not recommended for the central 

 and southern parts of this belt, however, as the same result can be better obtained 

 there by early picking followed by prompt destruction of the stalks. 



1941 - Glick, P. A., and K. P. Ewing. Studies of insect damage to cotton with reference 



to soil-conservation practices. J. Econ. Ent. 34(6):737-741 . 



Studies that are being made to determine the effort of the latest farming and 

 soil conservation practices on insects injurious to cotton in the Blacklands of 

 Texas. The plan of operation, the records made, the scope of the insect studies, 

 and the methods of making population counts of the different insects are de- 

 scribed. Detailed seasonal infestation records are being made of the boll weevil, 

 and the records are made of any unusual outbreaks of other insects on cotton. The 

 survey has been in operation for only 2 years, and no trends are so far evident; 

 it is anticipated that the work will not be completed for at least 9 or 10 years. 



1942 - Robinson, J. M., and E. L. Mayton. Yield in cotton due to control of boll weevil. 



Ala. Agr. Expt. Sta. 52d ann. Rpt. 1941:27-32. 



Results of experiments in 1924-41 in which the gain in yield of cotton due to 

 the control of boll weevil by dusting with calcium arsenate, in years in which the 

 amount of infestation required it, increased with the amount of fertilizer applied 

 to the plots. 



1943 - Dunnam, E. W., J. C. Clark, and S. L. Calhoun. Effect of the removal of squares 



on yield of upland cotton. J. Econ. Ent. 36(6):896-900. 



Experiments conducted at Stoneville, Miss., in 1939, 1940, and 1941, to de- 

 termine the influence of square removal on yield of upland cotton. All squares 

 over 6 or 7 days old were removed at weekly intervals for 1 to 9 weeks; and from 

 10% to 50% were removed at weekly intervals for 7 to 1 1 weeks. Indications were 

 that the square removal would result in a reduction of yield. The greater square 

 production which followed dusting with calcium arsenate in the absence of an 

 appreciable number of boll weevils was not manifested in increased yield. 



1946 - Ewing, K. P., C. A. King, Jr., and F. L. Thomas. Fight the boll weevil now by 

 plowing under the cotton stalks. Tex. Agr. Expt. Sta. Prog. Rpt. 1000-T. Oct. 

 15. 



Recommends the practice of destroying cotton stalks on a community- wide 

 basis, before frost, to reduce boll weevil infestations in the following season. 

 In States where conditions permitted, the early fall destruction of cotton stalks 

 was the last step in making the cotton crop of 1946 and the first step in making 

 the 1947 crop more economical and more profitable. 



1949 - Gaines, J. C., and H. G. Johnston. Acco. Press 15-18. M. June. Houston, Tex. 



Report of the results of a fall stalk destruction program which was con- 

 ducted on a voluntary basis in Williamson County, Tex., during 1947. Stalks 

 were destroyed early by all planters in the county and weevil infestations were 

 greatly reduced the following year. 



1950 - Watts, J. G. Maximum profit from cotton fertilizer dependent upon insect con- 



trol. S. C. Agr. Expt. Sta. Ann. Rpt. 61:91-92. May. 



Adequate nitrogen is necessary for profitable cotton production, but an ex- 

 cess can delay the setting and maturing of the bolls. In an experiment where 

 several rates of nitrate of soda side dressing were used, as the rate of applica- 

 tion increased, the percentage of the crop harvested at the first picking de- 

 creased. This was true whether or not the cotton was dusted for weevil control. 

 The delay in setting and maturing fruit, following the higher nitrogen applica- 

 tions, exposed more of the squares and small bolls to heavy boll weevil attacks. 

 As a result of delayed fruiting and incomplete weevil control, the application of 

 100 pounds per acre of nitrate of soda produced more cotton than did 200 and 400 

 pounds. Where there was no weevil control, more cotton was harvested from 



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