1925 - Ware, J. O. Cotton variety experiments. Ark. Agri. Expt. Sta. B. 197. 



Tests conducted in 4 sections of Arkansas. To obtain high production under 

 boll weevil conditions, earliness is necessary. The first picking is a direct 

 measure of earliness. Table summaries show the relation of the average of 

 the check variety (in all cases early varieties) with the other varieties. 



1925 - Ballard, W. W. Behavior of cotton planted at different dates in weevil control-- 

 Experiments in Texas and South Carolina. U, S. D. A. Dept. B. 1320, 43 p. 

 Apr. 



Information on plant growth characteristics during the growing season, as 

 related to the ability of the weevil to attack the plant. Experiments were con- 

 ducted at 3 widely separated parts of the cotton belt to secure comparative data 

 on plant development under different soil and climatic conditions. Information 

 was obtained on the effect of planting data, square formation, flowering, and 

 shedding. Lone star variety was used in these tests. 



1927 - Cook, O.F., and C.B.Doyle. Sea-Island and Meade cotton in the Southeastern 

 States. U„ S„ D. A. Dept. C. 414, 19 p., 7 ref. May. 



Sea Island Cotton has a greater susceptibility to boll weevil injury due to 

 thinner walls and softer texture of the bolls and also because it requires a longer 

 season to mature a full crop. The use of Meade cotton when grown from pure 

 seed, as a substitute variety, is discussed. In pure stands, fiber was equal 

 in length and quality to sea island and, under weevil conditions, distinctly larger 

 crops could be obtained. 



1927 - Isely, D. Ark. Agr. Expt. Sta. 39th Ann. Rpt. B. 221:34. Aug. 



Relation of abundance of boll weevil to color and size of leaf was studied in 

 1925-1926. Preference for green leaf cotton over red leaf was demonstrated. 

 After green leaf had become crowded for food, weevils would migrate to red leaf 

 cotton. 



1928 - Isely, D. The relation of leaf color and leaf size to boll weevil infestation. 



J. Econ. Ent. 2 1 (4):553-559. 



Field experiments in 1925 and 1926 indicate a marked preference on the 

 part of the boll weevil for green foliage as compared with red. No economic 

 importance can at present be attached, however, to the apparent immunity of 

 red-leafed cotton, as there is no red-leafed variety that can yet be recommended 

 for commercial planting. Negative results were secured in experiments to 

 determine any preference shown by A. grandis between large and small leafed 

 varieties, this character having hitherto been taken into consideration by some 

 plant breeders. Provided the size and vigor of the plants was about equal, no 

 apparent choice was shown between different leaf sizes. 



1933 - Calhoun, P. W. Irregularity among cotton plants in time of fruiting as a factor 



affecting susceptibility to damage by the cotton boll weevil. J. Econ. Ent. 

 26(6):1125-1128. 



Considerable irregularity seems to exist among cotton plants as regards 

 earliness of fruiting. Using the time of appearance of the first blossom on each 

 plant as the criterion, the frequency distribution for 600 plants approximated 

 a normal curve, the maximum for the frequency histogram occurring on the 11th 

 day. Such lack of uniformity in time of fruiting perhaps contributes to increased 

 susceptibility of cotton to damage by the boll weevil. 



1934 - Isely, D. Relationship between early varieties of cotton and boll weevil injury. 



J. Econ. Ent. 27(4):762-766. 



The varieties of cotton were evaluated in 1926, 1927, and 1929; (1) Trice. 

 (early), (2) Acala (medium early), and (3) Snowflake (late). Rowden was sub- 

 stituted for Snowflake in 1927. Although none of the experiments represented 

 conditions of extreme weevil injury, the early variety suffered the least weevil 

 injury and produced the best yield. 



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