1932 - Robinson, J. M., and F. S. Arant. Eight years of experimental work in boll 



weevil control on plots receiving different rates of fertilizer. J. Econ. Ent. 

 25(4):759-766. 



Experiments in the control of Anthonomus grandis Boh. with calcium ar- 

 senate dust have been conducted in Alabama over a period of 8 years, 1924-31, 

 on plots of cotton receiving different rates of fertilizer. Dusting was found to be 

 necessary during 5 years of the test and unnecessary during the other 3. The 

 date of the first 10% infestation varied from the 13th of June in 1927 to the 27th 

 of August in 1926. Applications of dust were made during the day when the air 

 was relatively calm. 



There was little increase in yield from dusting the unfertilized cotton. The 

 average gains from dusting were 246, 409, 396, and 365 lbs. of seed cotton per 

 acre on the plots receiving 500, 1,000, 1,500, and 2,000 lbs. of fertilizer, respec- 

 tively. The number of dustings per season varied from 3 to 11, with an average of 

 5.2, and the amount of calcium arsenate required per acre from 21 to 77 lbs. with 

 an average of 36. The average annual cost of the dusting operation was approxi- 

 mately $5 per acre. 



1933 - Marlatt, C. L. Report of the Chief of the Bureau of Entomology, 1933. U. S. D. A. 



Wash. 



Conditions regarding the boll weevil are discussed, together with experi- 

 ments for its control against cotton, chiefly by means of calcium arsenate dusts. 

 Parasitism in Louisiana in 1932 averaged a maximum of less than 10%, of which 

 90% was due to M. mellitor , other species reared being the Pteromalids, Cato- 

 laccus incertus Ashm., and C. hunter i Cwfd., Eurytoma tylodermatis Ashm., and 

 Eupelmus cyaniceps Ashm. 



1933 - Reinhard, H. J., and F. L. Thomas. Ingestion of poison by the boll weevil. Tex. 



Agr. Expt. Sta. B. 475. July. 



Approximately 65% of boll weevil mortality on dusted cotton occurred as a 

 result of accumulation of poison on mouth parts and accidental ingestion. Failure 

 of poison sprays seemed to be due to the facts that particles of poison are not 

 uniformly distributed and particles adhere more closely to the plant surface than 

 do dust particles. The presence of dust on the plants retarded crawling activities 

 by 60% and reduced number of fruits visited by 50%. Presence of pubescence on 

 stems not only retarded the movement of the weevil, but also caused the weevil to 

 bring its beak into contact with poison particles more frequently. Average mor- 

 tality among weevils on totally dusted plants was 90.4%. With free access to 

 clean or undusted fruits, mortality averaged 65.4%. 



1934 - Baerg, W. J., D. Isely, and H. H. Schwardt. Entomology. Ark. Agr. Expt. Sta. 



B. 312:34-38. Fayetteville. 



Very early varieties of cotton, only, benefited by 30.9%, while late varieties 

 gained by 120% from dusting against the cotton boll weevil. 



1934 - Robinson, J. M., and F. S. Arant. Entomology. Ala. Agr. Expt. Sta. Rpt. 44:27- 

 29. Auburn. 



Studies on the control of the boll weevil with calcium arsenate dust were 

 continued in 1932. Of 10 applications made during the fruiting season, 4 were 

 affected by rain within 24 hours, the yields of cotton were slightly above the 

 average for the past 6 years, and there was a definite increase on all fertilized 

 plots that had been dusted. The increased yields from dusted cotton were 213, 

 128, 426, and 400 lbs. of seed cotton per acre on the plots receiving 500, 1,000, 

 1,500, and 2,000 lbs. of fertilizer per acre, respectively. 



1934 - Strong, L. A. Report of the Chief of the Bureau of Entomology. U. S. D. A. 

 Wash. 



Infestation of cotton by the boll weevil was heaviest in Louisiana, Miss., and 

 southern Arkansas. In dusting experiments in South Carolina equal proportions of 

 hydrated lime and calcium arsenate at the rate of 8 lbs. per acre gave as good 



20 





