1920 - Pierce, W. D. A proposition for the reorganization of railroad agricultural work 

 in the interests of efficiency and increased tonnage. Mineral, Metal and By- 

 products Co., Dept. Biol., Spec. B. 2. Mar. Denver. 



In furtherance of his schemes for the eradication of the Mexican cotton boll 

 weevil and other pests the author appeals to the railway companies of the United 

 States to give active support to a service that is designed to report constantly 

 upon insect pest conditions, to enable experts to prepare for probable insect in- 

 festations and check them at the start. It is suggested that this should be a joint 

 railroad undertaking, and it is pointed out how greatly the railroads would benefit 

 by the increased tonnage that would result from a decrease in insect depreda- 

 tions. 



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



B. 1329, 30 p. 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. 



1924 - Harned, R. W., and Others. Biennial report of the State Plant Board of Missis- 



sippi for the years 1922 and 1923, 102 p., A, & M Coll. 



"The various inspection services are reported on by those in charge of them, 

 in which connection J. E. Lee briefly describes the experiments with the Florida 

 method carried out against the boll weevil . , . with apparently satisfactory re- 

 sults." 



1926 - Newell, W„, E. F. Grossman, and A. F. Camp. The Mexican cotton boll weevil. 

 Fla. Agr. Expt. Sta. Tech. B. 180. May. 



Reviews control measures (natural control, artificial control, dusting, 

 mopping, spraying, and killing of hibernated weevils). 



1926 - Walker, H. W., and J„ E„ Mills. Progress report of work of the Chemical War- 



fare Service on the boll weevil. J. Econ. Ent. 19(4):600-601 . bi-m. 1926. 



Preliminary results of a chemical screening program where some 1,000 

 poisons or poison mixtures were tested. About 50 showed a toxicity equal to or 

 greater than calcium arsenate. Amount of arsenic (soluble AS2O3) necessary to 

 poison a weevil is estimated at about 0.00015 milligrams. Average weight of a 

 boll weevil is 16 mg. 



1927 - Anonymous. Acuerdo sobre la reglamentacion para el combate del "Picudo" del 



algodon Mexico (Regulations for work against the cotton boll weevil in Mexico). 

 Sec. Agr. of Fomento, Bol. Mens. Defensa Agr. 1(1): 14- 1 5, 20-21. Jan. -May. 

 San Jacinto, F. 



Regulations, dated April 21, 1927, were issued by the Mexican government 

 for work against the cotton boll weevil, which was becoming a serious pest in the 

 cotton growing districts. Growers were required to report the presence of the 

 weevil, and local authorities to see that measures, including clean cultivation, 

 crop rotation, and dusting with calcium arsenate, were carried out, and that all 

 cotton plants or parts of plants were fumigated or otherwise disinfected before 

 being exported from infested districts. 



1936 - Dunnam, E. W. Pilosity of the cotton plant. J. Econ. Ent. 29(6):1085- 1087. 



Of 2 cotton varieties tested for boll weevil control at Stoneville, Miss., in 

 1935, the more pilose retained more arsenic pentoxide under all similar test 

 conditions, this character being more important when the plants are dusted dry. 



1947 - Gaines, J. C, W. L. Owen, Jr., and Read Wipprecht. Effect of dusting schedules 

 on the yield of cotton. J. Econ. Ent. 40(1):1 13- 1 15. 



Protection of the squares early in the season helped to set the early bolls 

 but failed to produce an increase in the total yield. At College Station in a delayed 

 schedule, picking was about 2 weeks later than in an early dusting schedule. All 



121 



