1907 - Marston, B. W., L. S. Frierson, and W. Newell. Report of the executive com- 



mittee upon the Paris green experiments conducted against the boll weevil during 

 1905. La. Crop Pest Comn. C. 8:31. 



A test was made of Paris green as a means of controlling the cotton boll 

 weevil. This remedy was applied to cotton kept under large wire-screen cages v 

 and under field conditions. 



The season was unfavorable to the work on account of the late development 

 of cotton and other difficulties met with in applying Paris green at the most ef- 

 fective period. When Paris green was applied at the rate of 10-3/4 lbs. per acre, 

 in each of 4 applications, nearly all of the boll weevils were destroyed. The in- 

 sects were greatly reduced in number by the use of 2-7/8 lbs. of Paris green per 

 acre also in each of 4 applications. The use of the large quantity of Paris green 

 resulted in considerable injury to the cotton and a diminished yield. 



The general conclusion reached from this series of experiments is that if 

 Paris green is applied to cotton that is blooming and squaring, the number of boll 

 weevils will be reduced but the injury to the cotton is quite serious. It is sug- 

 gested that during average seasons better results might be obtained if Paris 

 green were applied earlier. 



1908 - Newell, W., and T. C. Barber. Preliminary report upon experiments with pow- 



dered arsenate of lead as a boll weevil poison. La. Crop Pest Comn. C. 23:9-40, 

 3 fig. 



A brief review of the use of Paris green in combating the boll weevil. Ex- 

 periments with a powdered arsenate of lead showed it to be twice as effective as 

 Paris green; when applied to cotton just before the first squares formed, 70% of 

 the boll weevils present were killed. Conclusions as to the probable profit follow- 

 ing such application should be drawn with caution, since all the boll weevils are 

 not out of hibernation when the squares first appear. For the destruction of the 

 cotton caterpillar or leafworm in summer, powdered arsenate of lead was pre- 

 ferred to Paris green since it was equally effective, noninjurious to cotton plants, 

 and cheaper. Powdered arsenate of lead was also considered a better application 

 for the boll worm than Paris green. 



1908 - Newell, W., and T. C. Paulsen. The possibility of reducing boll weevil damage by 



autumn spraying of cotton fields to destroy the foliage and squares. J. Econ. 

 Ent. 1:113-117. 



Discussion of experiments with various chemical sprays used in an effort to 

 destroy cotton plants in fall without injuring lint. A 3% solution of iron sulfate 

 accomplished good results. 



1909 - Newell, W., and G. D„ Smith. Experiments with powdered arsenate of lead as a 



practical boll weevil poison. La. Crop Pest Comn. C. 33:252-333, 1 pi., 3 fig. 



On May 28, powdered arsenate of lead was applied to approximately 1/2 of a 

 9-acre field by means of a champion dust sprayer, 1 lb. per acre. When the cot- 

 ton was picked, 5,068 lbs. were taken from the poisoned plots of 4.38 acres; 4,638 

 lbs., from the nonpoisoned plot of 4.712 acres. 



In experiments with a liquid spray of lead arsenate, gains were too small to 

 justify the expense. To determine whether a high percentage of weevils could be 

 killed when squares and bolls were present on the plants, cage experiments with 

 powdered arsenate were made. The percentage of weevils killed by the arsenate 

 on fruiting cotton was considerably smaller than that on small cotton in the bud- 

 ding stage, but these experiments indicate that applications of powdered arsenate 

 should be continued after the first squares appear on the plants in spring. 



It is concluded that the best results are obtained with 5 applications, made 

 from 5 to 7 days apart, starting when the first squares form. Following the first 

 and second applications of from 2 to 2-1/2 lbs. per acre, the amount of arsenate 

 should be increased until at the fifth, from 4 to 7 lbs. per acre should be used. 

 Getting the poison into every terminal bud, into every blossom, and into the 

 involucre of every square is essential. 



An experiment conducted at midsummer in Baton Rouge is thought to demon- 

 strate the futility of trying to attack the boll weevils with the arsenate of lead 

 late in the summer. Experiments made by private parties are also considered. 



