1956 - Anonymous. Handbook on aerial application in agriculture. College Station, Tex. 

 Dec. 



A compilation of information resulting from research and conferences con- 

 ducted by the Texas Engineering Experiment Station, the Texas Agricultural 

 Experiment Station, and the Texas Agricultural Extension Service. The handbook 

 contains data on aerial applications to control the boll weevil and other cotton 

 insects. 



1956 - Smith, H. P., C. M. Hohn, and R. L. Hanna. Effects of spray nozzle types and 

 arrangements on cotton insect control. Tex. Agr. Expt. Sta„ Prog. Rpt. 1906. 

 Nov. 19. 



Tests on the use of spray nozzle types and arrangements conducted in 1955 

 and 1956 at the Brazos River Valley Laboratory continue to favor an arrangement 

 of 1 cone nozzle per row. 



There was no significant difference in yield in the 1955-1956 tests due to 

 nozzle types or arrangements. Equal control can be obtained with simple one- 

 nozzle-per-row arrangements as with more costly and complex arrangements. 



1959 - Adkisson, Perry L„, L. H. Wilkes, and B. J. Cochran. Relative efficiencies of 

 certain spray nozzles for cotton insect control. J. Econ. Ent. 52(5):985-991 . 



Two conventional cone-type spray nozzles were compared with 3 kinds of 

 wideswath, jet-type nozzles for effectiveness in controlling the boll weevil and 

 the bollworm, Heliothis zea (Boddie). The wideswath nozzles were capable of 

 spraying 6 to 12 rows per nozzle. Tests were arranged in randomized replicated 

 small plots and were conducted under irrigated and dry land conditions. Three 

 rates of application per acre were used. 



Results indicated that the conventional cone-type nozzles produced signifi- 

 cantly better control of the boll weevil than the wideswath nozzles. They also 

 were slightly more effective for controlling the bollworm. All treated plots pro- 

 duced significantly higher yields than the untreated check. However, the highest 

 yields were harvested from the plots sprayed with the conventional cone-type 

 nozzles. 



Card data collected for droplet size indicated that the wideswath nozzles pro- 

 duced larger droplets and decreased plant coverage with an increase in distance 

 from the nozzle. Weevil mortality records and yield data indicated that this larger 

 droplet size was mainly responsible for the inferior performance of the wide- 

 swath nozzles when compared with the cone nozzles. 



1959 - Wilkes, L. H., P. L. Adkisson, and B. J„ Cochran. Effect of spray nozzle types 

 on cotton insect control. Tex. Agr. Expt. Sta. Prog. Rpt. 2078. Mar. 1, 1959. 



In experiments conducted in 1958 near College Station, conventional low 

 gallonage, boomtype nozzles gave better insect control and produced higher 

 yields of seed cotton than 3 types of wideswath or boomless nozzles which 

 covered 6 or 12 rows per nozzle. 



CONTROL - IN GIN MILLS 



1905 - Hunter, W. D. Controlling boll weevil in cotton seed and at Ginneries. U. S. D. A. 

 Farmers' B. 209:31. 



The author carried on experiments to determine whether it is possible to pre- 

 vent the dissemination of this pest through the agency of cotton gins. When weevils 

 were passed through the main fan in a pneumatic elevator system with a rate of 

 1,800 revolutions per minute, all the weevils were destroyed. When weevils were 

 fed into the outer roll of a gin revolving at the rate of 400 revolutions per minute, 

 92.4% came through alive. In these experiments it was found that weevils may 

 escape with the seed into the seed chute and also at the mote board. Also, weevils 

 may pass through cleaning feeders without being injured. 



An account is given of the present system of handling and ginning seed cotton 

 in various localities. As a result of the author's observations and experiments it 



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