records indicated control was obtained 4 weeks after plant emergence but ef- 

 fectiveness did not persist long enough for control to be comparable with that 

 obtained with a conventional early- season insecticidal treatment. 



1957 - Parencia, C. R., Jr., J. W. Davis, and C. B. Cowan, Jr. Further field tests with 

 systemic insecticides employed as seed treatments. J. Econ. Ent. 50(5):6l4-6l7. 



The control of overwintering boll weevil with systemics was considered as 

 poor. Toxaphene spray treatments were more effective than the seed treatments. 



1957 - Pfrimmer, T. R. Insecticide tests against cotton insects as Tallulah, Louisiana, 

 in 1956. Assoc. So. Agr. Workers Proc. 54:145. 



Guthion (Bayer 17147) was the outstanding material used against the boll 

 weevil. The chlorinated hydrocarbons produced little or no control of the boll 

 weevil. 



1957 _ Robertson, R. L,., Effect of seed and soil treatment with systemic insecticides 

 and on cotton insects and on stand and yield of cotton. Assoc. So. Agr. Workers 

 Proc. 54:147. 



Boll weevil infestations were somewhat lower in plots receiving side dress- 

 ing with systemics than on untreated plots. No increases in yield over untreated 

 plots were obtained. There was, however, a reduction in yield from one thimet 

 treatment due to the reduction in stand resulting from seed treatment. 



Boll weevil and bollworms were controlled effectively with Guthion- DDT 

 sprays. Six applications of Guthion- DDT containing twice the regular concentra- 

 tion of Guthion and DDT, when applied at 8-day intervals, controlled boll weevils 

 and bollworms about as effectively as 12 sprayings at regular dosages of these 

 materials at 4-day intervals. 



1957 - Robertson, R. L., and F. S. Arant. Effect of different methods and intervals of 

 application of insecticides on cotton insect control. Assoc. So. Agr. Workers 

 Proc. 54:145-146. 



Toxaphene, endrin, and Guthion- DDT appeared to be about as effective 

 against boll weevil when applied as dusts at 8-day intervals at the average rate 

 of 30 lbs. per acre as when applied at 4-day intervals at 1 5 lbs. per acre. 

 Dieldrin-DDT mixtures were not effective at the longer intervals. Two applica- 

 tions of heptachlor or Guthion granules (1-1/2 lbs. of technical) followed by 4 

 conventional dustings with heptachlor-DDT and Guthion-DDT, respectively, were 

 about as effective as 13 conventional applications of toxaphene. There was no 

 indication of boll weevil resistance to the chlorinated hydrocarbon insecticides. 

 A heavy cotton aphid infestation developed in plots where calcium arsenate 

 was used and spread over the experimental area, with the exception of plots 

 treated with endrin and Guthion-DDT. Aphids were effectively suppressed in 

 plots treated with these materials. 



1957 - Roussel, J. S., J. Brazzel, R. C. Gaines, and R. Young. Effect of lipid content 

 of boll weevils on insecticidal action of endrin and guthion. Assoc. So. Agr. 

 Workers Proc. 54:144. 



Topical application of endrin or Guthion was made to boll weevils fed 

 squares, blooms, and bolls for varying periods of time. The lipid content of boll 

 weevils was determined. A discussion of the insecticidal action of endrin and 

 Guthion on boll weevils fed these different foods for varying periods of time is 

 given. 



1957 - Young, R., and J. S. Roussel. The effect of temperature on the efficiency of in- 

 secticides applied topically to the boll weevil. Assoc. So. Agr. Workers Proc. 

 54:144. 



Field- collected boll weevils were treated topically with toxaphene, endrin, 

 malathion, and combinations, and were held at post-treatment temperatures of 

 60°, 80°, and 90°F. 



74 



