1957 - Burkhalter, G. F., and F. S. Arant. Boll weevil resistance in Alabama. Assoc. 

 South. Agr. Workers Proc. 54:143. 



Laboratory tests were conducted during the 1956 season to determine the 

 susceptibility of 2-day-old boll weevils to chlorinated hydrocarbon insecticides. 

 Weevils reared from squares collected at Courtland, Lownsesboro, Frisco City, 

 Fairhope, and Auburn were treated topically with approximately 1 microliter of 

 toxaphene, endrin, or Guthion solution. Mortality counts were made 72 hours after 

 treatment. Boll weevils from Fairhope were more susceptible to toxaphene than 

 those from the other 4 localities. The LD-50of the most resistant strain was only 

 about 5 times that of the Fairhope strain. There was little evidence of resistance 

 to endrin and none to Guthion. 



These studies revealed no evidence of acute resistance of the boll weevil to 

 any insecticide studied. There was evidence of an incipient resistance to toxa- 

 phene, an insecticide used for a longer period than any other chlorinated hydro- 

 carbon on cotton in Alabama. 



1957 - Clower, D. F., J. S. Roussel, and H. Hardwick. Results of studies utilizing 

 granular formulation of insecticides for boll weevil control. Assoc. So. Agr. 

 Workers Proc. 54:145. 



Granular formulation of some insecticides applied to the soil resulted in 

 control of boll weevils susceptible to the chlorinated hydrocarbons, but failed to 

 control boll weevils resistant to these insecticides. Guthion did not control boll 

 weevils by this method of application. Thimet applied in granular formulation as 

 a side dressing was not effective for boll weevil control. 



1957 - Cowan, C. B., Jr., J. W. Davis, and C. R. Parencia, Jr. Control of the boll 



weevil and bollworm with chlorinated hydrocarbon and phosphorus insecticides 

 in 1956. J. Econ. Ent. 50(5):663-666. 



During 1956 experiments were conducted with chlorinated hydrocarbon and 

 phosphorus insecticides applied as dusts and as low-volume sprays on irrigated 

 cotton in central Texas for the control of late- season infestations of the boll 

 weevil and the bollworm ( Heliothis zea (Boddie)). 



In several experiments, 0.25 lb. and 0.375 lb. of dust and spray dosages of 

 Guthion gave good boll weevil control. EPN and methyl parathion at 0.5 lb. per 

 acre were as effective as endrin at 0.36 lb. Dipterex at 2 lbs. per acre was in- 

 effective. Thiodan at 0.5 to 0.6 lb. per acre showed promise in this control. 



1957 - Furr, R. E., M. E. Merkl, and E. P. Lloyd. Toxicity of organic insecticides to 



the boll weevil by topical application. Assoc. So. Agr. Workers Proc, p. 54:144. 



Results of topical applications using aldrin, BHC, dieldrin, endrin, Guthion, 

 heptachlor, methyl parathion, thiodan, and toxaphene in 1 microliter doses to 

 adult boll weevils. 



Field-collected weevils from 4 different localities in the State were topically 

 treated, and the materials used were compared as to location. LD-50 values are 

 presented for each material where it was possible to obtain such values. 



1957 - Gaines, J. C. Cotton insects and their control. Ann. Review of Ent. 2:322-325. 



A brief summary of the spread of the boll weevil in the United States and the 

 development of measures for control. 



1957 - Ivy, E. E., A. L. Scales, and L. J. Gorzycki. A new systemic insecticide for 

 cotton insects. J. Econ. Ent. 50(5):698-699. 



In a screening program at College Station, Tex., several promising systemic 

 insecticides were discovered. These materials were applied to cotton seed before 

 planting, and were tested against several cotton insects. The systemic action of 

 thimet persisted longer than that of the other compounds. This was particularly 

 true in the case of boll weevils, thrips, and cotton leaf perforators. No plant 

 injury from thimet was apparent in seed treated at 8 or 4 lbs. per 100 lbs. of 

 seed. 



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