included Sevin, Korlan, Monsanto CP-7769, Thiodan, Phosdrin, and Hercules 

 3895. Results on the effects of these materials against boll weevil, bollworms, 

 aphids, and spider mites are given. 



1958 - Walker, J. K., Jr. Control of boll weevils resistant to chlorinated hydrocarbon 

 insecticides. Tex. Agr. Expt. Sta. Prog. Rpt. 2009. Feb. 13. 



Evaluations of insecticides were made in two areas in the Brazos River 

 Valley--one with weevils resistant to chlorinated hydrocarbon insecticides and 

 one with no resistance. 



In the resistant area, phosphorus compounds were more effective than 

 chlorinated hydrocarbons. In the nonresistant area, each type of insecticide was 

 equally effective. 



1958 - Walker, R. L., Jr., A. R. Hopkins, and R. E. Fye. Effectiveness of several in- 

 secticides against the boll weevil, bollworm, and cotton leafworm. J. Econ. Ent. 

 51(6):783-786. 



In small-plot experiments at Florence, S. C, against the boll weevil, 

 Guthion-DDT, Thiodan, methyl parathion-DDT, EPN-DDT, and endrin dusts gave 

 comparable control and yields. Sprays and dusts of Guthion and endrin and a 

 spray of Dipterex were equally effective. Guthion-DDT spray gave significantly 

 better control and yield than toxaphene and heptachlor-DDT sprays. Sprays of 

 Guthion-DDT, Dipterex- DDT, methyl parathion-DDT, EPN-DDT, and endrin 

 gave comparable control and yields. Dusts of Sevin, malathion, Guthion-DDT, 

 and endrin gave comparable control. Sprays and dusts of Guthion, malathion, 

 and endrin were equally effective. In a spray, malathion was more effective at 

 2 lbs. per acre than at 1 lb. Malathion plus endrin was more effective than endrin 

 alone. Sprays of Sevin, Thiodan, endrin, toxaphene with and without methyl 

 parathion, and methyl parathion gave comparable control. 



In field-cage experiments against the boll weevil, malathion and methyl 

 parathion gave consistently high 24-hour mortalities. Combinations of malathion 

 with endrin or toxaphene were usually more effective than endrin or toxaphene 

 alone. Guthion was more effective than toxaphene and BHC. Thiodan was less 

 effective than endrin. Sevin at 2 lbs. per acre gave high 48-hour kills. Monsanto 

 CP-7769 and Chipman R-6199 were comparatively ineffective. Malathion was 

 residually more effective than endrin, methyl parathion, or Thiodan. 



1958 - Wene, George P., and Michael Schuster. Boll weevil control with heptachlor 



granules. J. Econ. Ent. 51(1):1 14. 



The results of this experiment indicate that applications of 2.5% heptachlor 

 granules to early localized boll weevil infestations will tend to prevent injury 

 early in the cotton season. 



1959 - Brazzel, J. R., B. G. Hightower, and T. L. Pate. A new method for the control 



of boll weevils. Tex. Agr. Expt. Sta. Prog. Rpt. 2110. Oct. 9. 



A late season chemical and cultural control program in 1959 showed 

 promise in reducing the overwintering population of boll weevils. This reduction 

 appears to be great enough to delay the start of boll weevil control programs the 

 following year to effect substantial savings in insecticide costs. 



The program consists of chemical treatment just prior to and during the 

 harvest period to prevent the weevil from going into diapause, the physiological 

 condition in which they survive the winter. These insecticide treatments are 

 followed by stalk destruction if harvest is completed before frost kills the cotton. 



Results indicate that this practice may be an effective eradication measure. 



1959 - Cowan, C. B., Jr., C. R. Parencia, and J. W. Davis. Field experiments for 

 control of late- season infestations of several cotton insects. J. Econ. Ent. 

 52(5):975-977. 



Sevin (1-naphthyl-N-methyl carbamate) applied at 1.0 and 1.6 lbs. per acre 

 in dusts and at 1.5 lbs. per acre in a spray gave effective control of the boll 



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