1945 - Gaines, R. C. Effect of reduced amounts of calcium arsenate on boll weevil con- 



trol and cotton yield. J. Econ. Ent. 38(3):300-304. 



In field-plot experiments conducted at Tallulah, La., from 1933 to 1943, the 

 amount of calcium arsenate applied, either alone or in a mixture, was greatly- 

 reduced from the average application of about 6 lbs. per acre. Dosage signifi- 

 cantly affected percentage of boll weevil control, but the effect on yield was not 

 significant. Reductions in the amounts of calcium arsenate applied in cage tests 

 were followed by reductions in the mortalities of boll weevils. 



1946 - Annand, P. N. Report of the Chief of the Bureau of Entomology and Plant Quar- 



antine, Agr. Res. Admin., U. S. D. A. 1944-45. Wash. 



DDT was much less effective than calcium arsenate against the boll weevil 

 in Louisiana in 1945. BHC had both fumigant and contact action against A. grandis 

 and was more effective than DDT, although calcium arsenate gave the highest 

 mortality. 



1946 - Bishopp, F. C. The insecticide situation. J. Econ. Ent. 39(4) :452. 



A 10% dust of 2-hydroxy-2,4,4,4 prime, 7-pentamethyl flavan was ineffective 

 against the boll weevil on cotton, much less effective than calcium arsenate. 



1946 - Bondy, F. F. and C. F. Rainwater. Cotton insect investigations. S.C. Agr. Expt. 

 Sta. 1944-1945 Rpt. 58:101-105. Clemson. 



Field experiments over several years on the control of boll weevil on cotton 

 in South Carolina showed that mopping at the presquare stage with a mixture of 

 calcium arsenate molasses and water (1:1:1) reduced early weevil populations and 

 effected some degree of control, but, as the time for mopping is usually over be- 

 fore the hibernating weevils have completed their emergence, this method was 

 not satisfactory in years of heavy weevil damage. 



Temperature was the most important factor determining the survival of 

 A. grandis in winter, but humidity had the greatest influence on emergence in the 

 spring. Emergence was late in dry springs, regardless of temperature, and early 

 wet springs seemed to extend the period of emergence, although the larger per- 

 centage of weevils emerged early. 



1946 - Isely, D. The cotton aphid. Ark. Agr. Expt. Sta. B. 462, p. 29, 3 illus. 



The possibility of the development of an aphid outbreak, after calcium ar- 

 senate dusting for the cotton boll weevil, increases with the number of dust appli- 

 cations. Outbreaks also develop more rapidly where dusting is general in a 

 region. Where spot dusting is practiced only for boll weevil control, the likeli- 

 hood of aphid injury is relatively small. 



1946 - Ivy, E. E., and K. P. Ewing. Benzene hexachloride to control cotton insects. 

 J. Econ. Ent. 39(1):38-41. 



In laboratory and cage tests at Waco, Tex., benzene hexachloride dust pro- 

 duced excellent control of several of the more important cotton insects. Control 

 of the boll weevil and the cotton leafworm was better than with calcium arsenate. 



1946 - Parencia, C. R., Jr., E. E. Ivy, and K. P. Ewing. Control of bollworm and cotton 

 flea hopper by DDT. J. Econ. Ent. 39(3):329-335. 



Infestation records made in various field-plot experiments showed that DDT 

 does not give satisfactory control of the boll weevil. In one experiment 6 applica- 

 tions of DDT caused marked increases in populations of the red spider, Tetrany- 

 chus sp. 



A large-scale experiment conducted at Waco for maximum combination 

 control of bollworm and boll weevil, using DDT -sulfur mixture and calcium ar- 

 senate produced an average of 1963 lbs. of seed cotton per acre on 36 treated 

 acres and an average of 844 lbs. per acre on 2 adjoining untreated acres, or a 

 gain of 1,119 lbs. per acre. 



39 



