1958 - Beckham, C. M., and L. W. Morgan. Evaluation of systemic insecticides for 

 control of cotton insects. Ga. Agr. Expt. Sta., Mimeo Ser., n. s. 54. April. 



Field tests were conducted to obtain information on the effects of different 

 rates of thimet and Di-syston applied as seed treatments and as granulated 

 formulations in the furrow on plant emergence. There was no adverse effect on 

 germination. Results of square counts showed that thimet and Di-syston were 

 not effective in controlling the boll weevil. 



1958 - Bottger, G. T., A. J. Chapman, Rex L. McGarr, and C. A. Richmond. Labora- 

 tory and field tests with sevin against cotton insects. J. Econ. Ent. 51 (2):236-239. 



In laboratory tests at Brownsville, Tex., Sevin ( 1 -naphthyl-N- methyl 

 carbamate) applied as a spray to potted cotton plants was effective against the 

 boll weevil ( Anthonomus grandis Boh.), the pink bollworm ( Pectinophora 

 gossypiella Saund.), the bollworm (Heliothis zea Boddie), the cabbage looper 

 ( Trichoplusia ni Hbn.), and the cotton aphid ( Aphis gossypii Glov.). On field 

 plots in the Lower Rio Grande Valley, dusts containing 1.5 to 2.5 lbs. of Sevin 

 per acre applied at 4- to 7-day intervals gave control of the pink bollworm and 

 the boll weevil comparable with that obtained with standard insecticides. 



1958 - Furr, R. E., and E. P. Lloyd. Preliminary field cage studies on the residual 



toxicity of methyl parathion, Guthion and malathion to adult boll weevils. Assoc. 

 So. Agr. Workers Proc, 55:122. 



Guthion 0.25 lb./ac, methyl parathion 0.25 lb./ac, and malathion 0.5 lb./ac 

 were applied as emulsions to field plots at the rate of 3.7 gallons of spray per 

 acre. Fifty adult boll weevils were confined to each treated plot immediately 

 after treatment and at 2-hour intervals thereafter for 12 hours. Mortality counts 

 were made each hour for 10 hours. Guthion gave highly effective kill in 24 hours, 

 even when the weevils were caged 12 hours after treatment. Methyl parathion was 

 not effective (less than 75% kill) 4 hours after treatment. Malathion was not 

 effective 8 hours after treatment. 



In a second experiment, Guthion 0.5 lb./ac, methyl parathion 0.5 lb./ac, and 

 malathion 2.0 lbs./ac were used. Guthion was highly effective in this experiment. 

 Methyl parathion was effective for 6 hours, and malathion was effective for 24 

 hours, even when the weevils were caged 24 hours after treatment. 



1958 - Hightower, B. G., and D. F. Martin. Effects of certain climatic factors on the 



toxicities of several organic phosphorus insecticides. J. Econ. Ent. 51(5):669-67 1 . 



The independent effects of wind, simulated rain, and temperature variations 

 on the residual toxicities of several organic phosphorus pesticides were evaluated 

 in laboratory tests. The boll weevil and the tumid spider mite ( Tetranychus 

 tumidus Banks) were used as test animals. 



Temperature and humidity variations encountered under prevailing green- 

 house conditions were important factors contributing to the loss of residual 

 toxicity in these compounds. Phosdrin lost most of its residual toxicity to boll 

 weevils and spider mites when exposed to temperatures ranging from 70°F. to 

 104°F., and relative humidity ranging from 40% to 86%. Guthion spray was 

 superior to endrin or dieldrin sprays when subjected to temperatures above 

 100°F. before release of boll weevils on the plants. 



Guthion dust was more effective than toxaphene or dieldrin dusts under pre- 

 release windy conditions at relatively high temperatures. Simulated rain appre- 

 ciably reduced the residual toxicities of Guthion, methyl parathion, and malathion 

 sprays. 



1958 - Hopkins, A. R., R. E. Fye, and R. L. Walker. Field tests with thimet and Bayer 

 19639 for cotton-insect control. J. Econ. Ent. 51 (1 ):100- 1 02. 



Experiments were conducted to determine the effectiveness of seed treat- 

 ments of thimet and Bayer 19639, in- furrow applications of granular thimet made 

 at the time of planting and side dressing applications of granular thimet for the 

 control of cotton insects, and also, to determine the effect of the materials on the 

 cotton plant itself. The treatments tested afforded virtually no control of the boll 



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