weevils in a few days of wet weather, while adjacent plantings of upland cotton 

 showed much less damage to the bolls. 



In consequence of the necessity of making the tests with the two varieties of 

 cotton growing side by side and the impossibility of protecting the Sea Island 

 cotton (which requires a longer season to mature a full crop) from weevils that 

 may breed on the upland cotton, it was difficult to determine the greater extent of 

 damage to Sea Island cotton. 



Control by means of poisons was not practicable in the wet weather which 

 often prevails in the coast districts at the critical stage of the fruiting season, 

 and precautionary measures were only of value where there is whole-hearted 

 cooperation on the part of the growers. The author suggests that weevil injury 

 might be avoided by planting cotton only in alternate years in isolated districts 

 where one variety is grown exclusively, since the weevils do not breed on other 

 plants and could not multiply if no cotton were planted in the intervening years. 

 The importance of the established restrictions on the import of cotton seed is 

 emphasized. 



1927 - Morrill, A. W. Observations on Bucculatrix Gossypiella, a new and important 



cotton pest. J. Econ. Ent. 20(3):536-544. 



In the Yaqui Valley area in Mexico, - "April and May appear to be a more 

 favorable time for planting cotton than February and March from the point of 

 view of controlling B. gossypiella and A. grandis." Should further investigations 

 confirm this, the author suggests a Government regulation prohibiting the plant- 

 ing of cotton before April 15 and requiring the destruction of cotton stalks before 

 January 15, or some other specified date. 



1928 - Hinds, W. E. The effect of the spacing of cotton upon the form and height of the 



plant. J. Econ. Ent. 21(5):741 -748. 



Results of tests carried out from 1924 to 1926 on Mississippi River bottom 

 soil to determine the effect of spacing of cotton upon the yield secured, particu- 

 larly under conditions of infestation by the boll weevil. Previous tests showed that 

 in practically all cases it is advisable to plant the rows as closely as possible 

 with due allowance for the normal height of the plants and the culture required, 

 and also to leave the plants much thicker in the row than had hitherto been the 

 custom. In the tests described, hill spacing with 3 to 5 stalks at 1 or 2 feet apart 

 appeared to be the most practicable and desirable. 



1930 - Isely, D. Ark. Agr. Expt. Sta. 42d. Ann. Rpt. B. 257:54-55. Nov. 



An experiment in control of boll weevil by destruction of places in which it 

 might hibernate was undertaken in Crawford County- -600 acres on 12 farms. All 

 woodland within or bordering was subject to overflow or had no high pastures or 

 other high land subject to cultivation. Actual adjacent land requiring cleanup was 

 less than 5 acres, or less than 1% of the total acres of woodland. Winter of 1929- 

 30 temperature was as low as 9°F. Nevertheless, boll weevil survived in fair 

 numbers and was found in 8 out of 10 fields outside the cleanup area. No injury in 

 the test area was found in 1930. A trace of infestation was found in a single spot 

 near the margin of the field. 



1932 - Folsom, J. W. Insect enemies of the cotton plant. U. S. D. A. Farmers' B. 1688, 

 28 p. July. 



A revision of and superseding Farmers' Bulletin 890, How Insects Affect the 

 Cotton Plant and Means of Combating Them. 



Rotation of crops is of assistance in controlling many cotton pests. Weeds 

 should not be allowed to grow near the cotton, for many pests come to the cotton 

 from other crops or from weeds around the fields. Thorough fall plowing, winter 

 cover crops, early spring population, and repeated cultivation during the season 

 are important measures of insect control. An early crop is necessary. The cotton 

 plants should be turned under in the fall, if possible, before frost. Descriptions 

 are presented of many cotton insects, including the boll weevil, and their work 

 with suggestions for their control. 



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