1924 Howard, L. O. Report (1923-24) of the Entomologist. U. S. D. A. Bur. Ent. Rpt. 

 30 p. Wash. 



"The use of calcium arsenate against the cotton boll weevil ... is now be- 

 coming so general as to make the results more or less a matter of local and 

 seasonal conditions. Particular attention was given to a study of the increase of 

 infestation by aphids that sometimes accompanies the use of the poison. This can 

 usually be avoided by proper modification of the poisoning schedule without 

 interfering with the successful control of the weevil. The use of aeroplanes for 

 dusting is being developed, and at least 5 distinct types of dusting equipment have 

 been devised to meet the requirements of the different flying characteristics of 

 the aeroplanes employed." 



1924 - Isely, D., and W. J. Baerg. The boll weevil problem in Arkansas. Ark. Agr. 

 Expt. Sta. B. 190, 22 p., 8 fig. Jan. Fayetteville. 



A general account is given of the cotton boll weevil in Arkansas. The early 

 production of cotton and the destruction of the weevils in hibernation are recom- 

 mended. Early infestations may be checked by applications of calcium arsenate 

 dust, 5 to 7 lbs. per acre, which should be given only where weevils actually 

 occur. The treatment should begin when the weevils have punctured 10% to 15% 

 of the squares, and be continued for 3 or 4 applications at intervals of 4 or 5 

 days. 



1924 - Leiby, R. W., and J. A. Harris. Habits and control of the cotton boll weevil in 



North Carolina (progress report of its life history and control made during 1923). 

 N.C. Dept. Agr., 19 p., 7 fig. Mar. Raleigh. 



Tests of remedies for the cotton boll weevil in North Carolina during 1923 

 indicate the advisability of giving one application of homemade poison, consisting 

 of 1 lb. calcium arsenate and 1 U.S. gal. each of molasses and water, just when 

 the squares begin to form, the poison being applied with a mop to the buds. It is 

 considered that when 4 to 7 applications are mopped on the plants during the 

 season (especially the fruiting time) the cost is as great as, or greater than, the 

 value of the cotton gained by the treatment. 



The Florida Method is not recommended for general adoption. It is recom- 

 mended that the 1 mop poisoning be followed up by 4 to 7 applications of calcium 

 arsenate dust, beginning when 10% of the squares are punctured, and continuing 

 at intervals of 4 or 5 nights at the rate of 5 to 7 lbs. of poison per acre. The dust 

 should be driven into the squares. Dead weevils will frequently be found there 

 afterwards. 



1924 - Marcovitch, S. Sodium fluosilicate. Indus. Engin. Chem. 16:1249, Easton, N.Y. 

 Pure sodium silicofluoride was found to be an efficient insecticide against 

 the cotton boll weevil. In cage tests all weevils were killed in from 5 to 24 hours. 

 The weevils died even after mere contact with the powder. The advantages of this 

 substance over arsenical compounds are that it is cheaper, it acts as a contact 

 poison, kills more rapidly, and is less poisonous to man. The disadvantage of the 

 commercial product is its density. 



1924 - Marcovitch, S. New insecticides for the Mexican bean beetles and other insects. 

 Tenn. Agr. Expt. Sta. B. 131, 19 p., 7 fig. Oct. Knoxville. 



"Sodium fluosilicate 1-9 was equally effective against Leptinotarsa decem- 

 lineata (potato beetle), Epitrix cucumeris (potato flea-beetle), etc., but when 

 undiluted with lime, it caused some injury to plants. In all tests conducted with 

 Anthonomus grandis (cotton boll weevil), the weevils were killed in from 5 to 24 

 hours. Cotton is a comparatively resistant plant, and is not injured, even when 

 the substance is used undiluted." 



1924 - Nickels, C. B. Results secured from late season applications of calcium arsen- 

 ate dust for the control of the cotton boll weevil. J. Econ. Ent. 17(4):477-480. 



The cotton boll weevil causes severe damage to late fruiting cotton after the 

 beginning of migration. Serious injury (causing poison to be required) did not 



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