Roussel, J. S., L. D. Newsom, and C. E. Smith. Insecticide tests for the control 

 of cotton pests in Louisiana during the period 1948-51 . Assoc. So. Agr. Workers 

 1952 Proc, 49th Ann. Conv., p. 81. 



When DDT was added to either aldrin, gamma isomer benzene hexachloride, 

 dieldrin, or heptachlor, satisfactory control of the boll weevil-bollworm complex 

 was obtained. 



1952 - Swain, R. B. Insect problems in Nicaragua. F.A.O. Plant Prot. B. l(2):27-28, 



Rome. 



A. grandis was very destructive in Nicaragua in 1951 and again in Sept. 

 1952 when plants were 3-6 weeks old. The weevils were controlled by early and 

 late applications of Folidol E605, toxaphene, DDT-aldrin, DDT-chlordane, and 

 BHC- DDT- sulfur. Early treatment was made when the plants were in the 4-leaf 

 stage and when infestations of boll weevil reached 10%- 25% applications made 

 every 3-5 days. 



Young, M. T., and R. C. Gaines. Insecticide tests for control of the boll weevil, 

 bollworm, cotton aphid, and two- spotted spider mite on cotton. So. Agr. Workers 

 Assoc. Proc, 49th Ann. Conv., p. 81. 



In experiments at Tallulah, La., in 1951, using 0.1 -acre field plots in ran- 

 domized blocks with 4 replicates, dust mixtures containing 1.25%, 2.50%, or 5.00% 

 aldrin with 5% DDT and 40% sulfur, dust mixtures containing .75%, 1.50%, or 3.00% 

 dieldrin with 5% DDT and 40% sulfur, and a dust mixture containing 2.50% hep- 

 tachlor, 5% DDT and 40% sulfur gave good control of the boll weevil. Five dif- 

 ferent mixtures containing 3% or 6% of gamma benzene hexachloride and 5% or 

 10% DDT, some with or without 40% sulfur or 4% aramite, and lime-free calcium 

 arsenate with 2.5% or 5.0% DDT and 0.5% or 1.0% parathion, gave good control of 

 the boll weevil. The benzene hexachloride-DDT mixtures gave a greater increase 

 in yield than the lime-free calcium arsenate mixtures. 



Toxaphene dust (20%) gave better boll weevil control and a greater increase 

 in yield than toxaphene spray. Aldrin and dieldrin sprays, with and without DDT, 

 gave good boll weevil control, but the dieldrin- DDT spray did not yield so well as 

 the other sprays, since it caused a greater buildup of spider mites. 



1953 - Berry, P. A., and L. Abrego. Insects and diseases affecting some crops in El 



Salvador. F.A.O. Plant Prot. B. 1(1 0):1 51- 1 53. Rome. 



The most injurious pest of cotton in El Salvador is A. grandis Boh. which 

 feeds and breeds through the year. Although it appears in any small planting, 

 however isolated, no alternative food plants are known. Control is hindered by 

 rain, which falls almost every day throughout the growing season. H. armigera 

 Hbn. also attacks cotton and breeds throughout the year, but, in the absence of 

 insecticidal treatment against A. grandis Boh., appears to be held in check by 

 natural enemies. When insecticides are applied against A. grandis, additional 

 treatments against tl. armigera are often necessary. 



1953 - Blake, G. H., Jr. The effect of chemical control on insect infestation and on 

 yield and quality of cotton. Assoc. So. Agr. Workers Proc, 50:11. 



Experiments were conducted in Alabama in 1947 to determine the effect of 

 chemical control on insect infestation and on yield and quality of cotton. Four of 

 6 insecticidal treatments tested caused significant increases in the yield of cotton 

 over the check. The data indicated that bollworm infestations have more effect on 

 yield than boll weevil infestations and that boll weevil infestations have more ef- 

 fect on yield of cotton than do infestations of the cotton aphid. The insecticidal 

 treatments had no significant effect on lint percentage, grade, or staple length 

 of cotton. 



1953 - Calhoun, S. L., and E. W. Dunnam. Heptachlor and other insecticides for control 

 of cotton pests. J. Econ. Ent. 46(1 ): 1 57- 1 58. 



Two field experiments were conducted at Stoneville, Miss., to determine 

 minimum dosages of heptachlor required for the control of the boll weevil and 

 its effect on other cotton pests. Tractor equipment was utilized to apply dusts 



59 



