1921 - Tanquary, M. C, and H. J. Reinhard. Dusting cotton for the control of the boll 

 weevil. Tex. Agr. Expt. Sta. C. 29, 9 p., 1 fig. Apr. Col. Sta. 



The dusting method for the control of the cotton boll weevil, as developed by 

 Coad, proved successful under Texas conditions. A list of precautions is given as 

 a guide for those adopting this method. 



1921 - Warren, D. C. Cotton dusting experiments of 1920. Ga. State Bd. Ent. B. 59, 



16 p. Feb. Atlanta. 



During 1920, experiments were undertaken to determine more accurately 

 the value of using calcium arsenate to kill the cotton boll weevil in Georgia. The 

 results showed that this poison, properly applied, is a successful remedy. In 

 heavy infestations the dust should be applied once or twice, just before the 

 squares are large enough to be punctured. While they are being attacked, 2 or 3 

 dustings should be given at intervals of 3 or 4 days, until the weevils are under 

 control. The applications should then be discontinued until infestation begins 

 again. From 5 to 7 lbs. of dust should be used per acre each time. Considerably 

 better results are obtained by dusting while the dew is on the plants. The calcium 

 arsenate used should be of standard composition. 



It was impossible in 1920 to estimate accurately the profits gained by dust- 

 ing; it is now considered that a gain of 100 lbs. of seed cotton will pay the cost of 

 poisoning. Average gains were considerably above this. A limited number of 

 tests were made to determine whether dusting would be profitable while the 

 plants are very small and the weevils that have survived the winter are feeding 

 on the buds. 



1922 - O'Kane, W. C. One year of the Crop Protection Institute. J. Econ. Ent. 15(3):209- 



213. 



The first year of work is briefly reviewed. A conference was held in New 

 York on the control of the cotton boll weevil, and a concise statement of rules 

 relating to dusting against this past was prepared. 



A cooperative dusting project in several States was successfully carried out 

 under the direction of the Institute, which proved the organization to be an avail- 

 able means of bringing about profitable and desirable cooperation among inves- 

 tigations. 



1922 - Smith, G. D. Preliminary report upon an improved method of controlling the boll 

 weevil. Fla. State Plant Bd. Q. B. 7(1): 1-64, 13 fig. Oct. Gainesville. 



A study of boll weevil conditions in Florida suggested that the first genera- 

 tion of weevils could be destroyed by stripping from the cotton plants the first 

 squares of the season, and with them the eggs deposited by the weevils after 

 hibernation. Care must be taken that all weevils are out of their winter quarters 

 before this is done. In normal seasons, the squares should be removed between 

 June 5 and 8 and followed by a thorough application of calcium arsenate or lead 

 arsenate at the rate of 5-7 lbs. per acre, using a suitable dusting machine. The 

 weevils, deprived of squares in which to hide and feed, will attack the terminal 

 buds for food, and these buds can easily be filled with poison by means of a dust 

 gun. This method destroyed practically every weevil that had escaped capture in 

 the stripping operation. [A table recording emergences of the weevils at various 

 places shows that 99% are out of hibernation and in the cotton fields by June 5.] 

 In order to get the plants into the right fruiting stage for treatment, nonfertilized 

 cotton should be planted about the last week in March. If much fertilizer is used, 

 planting should be one week later. If the season is unusually late, the treatment 

 should be delayed for a few days, until enough squares have appeared on the 

 plants to act as traps for the adult weevils. 



The effect of stripping the squares on the yield of cotton is discussed, and 

 the life history of the weevils in Florida, with a view to satisfactory application 

 of the remedies, is dealt with. The second generation of weevils matures about 

 August 5, at the earliest, and by this time the Florida crop of short staple is 

 sufficiently matured to escape practically all damage by the weevils. Many field 

 tests with these methods are recorded in detail, and the best method of removing 

 the squares and of applying the poisons are explained. 



