1947 - Rainwater, C. F. Some insecticides causing boll weevil mortality inside of punc- 

 tured cotton squares. J. Econ. Ent. 40(6):923-925. 



To test the ovicidal or larvicidal action of certain new insects, fallen fruiting 

 buds or squares in which eggs had been deposited were collected from field treated 

 plots and held in cages until emergence of weevils was apparently complete and 

 then examined for weevil mortality. Calcium arsenate, 50% DDT or 1% to 5% 

 0,0-diethyl 0-p-nitrophenyl thiophosphate caused little mortality of weevils devel- 

 oping within the punctured squares. A 20% chlorinated camphene caused some 

 mortality, but a 10% material evidenced very little. BHC and a mixture of BHC 

 and DDT from 2 different sources gave wide differences in mortality. BHC did, 

 however, give appreciable mortality. Chlordane was the most effective material 

 tested. 



1947 - Rainwater, C. F., and F. F. Bondy. New insecticides to control boll weevil and 



cotton aphid. J. Econ. Ent. 40(3):37 1 -373. 



Field experiments were conducted at Florence, S.C., to compare the effect 

 of several insecticides and combinations of insecticides, including benzene 

 hexachloride and DDT, against the boll weevil and the cotton aphid. For boll 

 weevil control, benzene hexachloride at strengths of 1.0% to 5.75% of the gamma 

 isomer compared favorably with calcium arsenate. Mixtures of DDT and benzene 

 hexachloride were more promising than benzene hexachloride alone. Ryania 

 powder (50%) did not compare favorably with calcium arsenate, benzene hexa- 

 chloride, or DDT. 



1948 - Dunnam, E. W., and S. L. Calhoun. Benzene hexachloride to control boll weevil 



and cotton aphid. J. Econ. Ent. 41(l):22-25. 



Tests were conducted in the area of Stoneville, Miss., to compare benzene 

 hexachloride with calcium arsenate and nicotine for the control of the boll weevil 

 and the cotton aphid, Aphis gossypii Glov., respectively. 



Benzene hexachloride at 5% concentration of the gamma isomer was as effec- 

 tive as calcium arsenate for boll weevil control when applied at the same rate 

 per acre at 4- or 5-day intervals. The residual effect of benzene hexachloride in 

 control of the boll weevil was at least no better than that of calcium arsenate, and 

 a 7 -day interval was beyond the range of effectiveness. 



1948 - Ewing, K. P., and C. R. Parencia, Jr. Control of boll weevil and cotton aphid with 

 dusts containing chlorinated camphene, benzene hexachloride or other new in- 

 secticides. J. Econ. Ent. 41(4) :558-563. 



Several experiments were conducted in Texas in 1947 to determine the value 

 of some of the newer insecticides against the boll weevil and the cotton aphid, 

 Aphis gossypii Glov. In a small-plot experiment at Wharton the yields of cotton 

 dusted with calcium arsenate, 2 mixtures of DDT and benzene hexachloride, and 

 2 concentrations of chlorinated camphene showed no significant differences. 

 However, the least weevil control and the lowest yield were obtained from the 

 10% chlorinated camphene plots. 



In 5 large-scale experiments in the same general location, 20% chlorinated 

 camphene gave slightly better control, and the 10% chlorinated camphene gave 

 slightly poorer control than calcium arsenate. Aphids caused considerable dam- 

 age in most of the plots dusted with calcium arsenate but not in those dusted with 

 chlorinated camphene. As a result of the combined control of both weevils and 

 aphids, both strengths of chlorinated camphene effected higher yields than the 

 calcium arsenate. In experiments in which the dusted plots were strictly com- 

 parable, 20% chlorinated camphene produced a gain over the check of 539 lbs., as 

 compared to a gain of 360 lbs. from calcium arsenate; and 10% chlorinated cam- 

 phene, a gain of 494 lbs., as compared with 211 lbs. from calcium arsenate. 



In a small-plot experiment at Waco, where both weevils and fleahoppers 

 were causing damage, plots treated with calcium arsenate and 10% and 20% chlo- 

 rinated camphene produced significantly more cotton than the check. The chlori- 

 nated camphene dusts were significantly better than the calcium arsenate. There 

 was no significant difference in yield between the 2 concentrations of chlorinated 

 camphene. 



43 



