At one location, all the dusts significantly reduced boll weevil infestation 

 over the control plots. Calcium arsenate and 1% nicotine, in the form of Black 

 Leaf 10, resulted in much higher yields and lower aphid infestation levels than 

 any other treatment. The reduction of boll weevils was similar to those on plots 

 treated with calcium arsenate alone or with 10% sulphur and 0.5% rotenone (der- 

 ris), and was considerably lower than on plots treated with calcium arsenate, 

 10% sulphur, and 0.2% pyrethrins in the form of Pyrocide (2% pyrethrins). 



Boll weevil infestation was heaviest on the control plot and not significantly 

 lower on those receiving calcium arsenate with sulphur and pyrethrins or rote- 

 none, but significantly lower on plots treated with calcium arsenate alone or with 

 nicotine. The plants treated with nicotine, which bore very low populations of 

 aphids, kept their foliage considerably longer than plants on the other plots. 



In the 2 experiments, calcium arsenate alone, with nicotine, with sulphur and 

 rotenone, and with sulphur and pyrethrins resulted in average increases in yield 

 of 323, 359, 1 68, and 258 lbs. of seed cotton per acre, respectively, over the con- 

 trol plots. 



1942 - Bondy, F. F. Mopping, dusting, and combination treatments for boll weevil con- 

 trol in South Carolina. J. Econ. Ent. 35(4):498-499. 



A total of 187 field experiments were carried out against the boll weevil at 

 Florence, S.C., in 1928-41, to determine the comparative value of a mopping mix- 

 ture of calcium arsenate, molasses, and water (1:1:1) applied to cotton in the 

 pre-square stage, calcium arsenate dust applied after 10% of the squares had 

 been punctured, and a combination of these 2 treatments. The average increases 

 in yield over comparable untreated plots were 39, 286, and 331 lbs. of seed cotton 

 per acre, respectively, with average net profits of $1.10, $9.60, and $11.40 per 

 acre for the 3 treatments. 



1942 - Ewing, K. P., and R. W. Moreland. Insecticides to control bollworm, boll weevil, 

 cotton aphid, and cotton flea hopper. J. Econ. Ent. 35(5):626-629. 



Basic copper arsenate mixed with sulfur or lime produced higher yields of 

 cotton than calcium arsenate, lead arsenate, or cryolite in experiments for the 

 control of the bollworm and the boll weevil. Yields were higher than from sulfur 

 or sulfur -arsenical mixtures in experiments for the control of the flea hopper. 



The increase in aphids that followed dusting with basic copper arsenate and 

 sulfur was less than half as great as that which followed dusting with calcium 

 arsenate or zinc-safened calcium arsenate. On cotton dusted with calcium arsen- 

 ate there were 316 times as many aphids when 0.5% of rotenone was added as 

 when 1% of nicotine was added. Calcium arsenate containing zinc sulfate showed 

 little promise of holding down aphids. 



1942 - Fenton, F. A., and K. S. Chester. Protecting cotton from insect and plant dis- 

 eases. Okla. Agr. Expt. Sta. C. 96, 32 p., 13 fig., 1 ref. Stillwater. 



Cotton should be planted early, for the number of weevils increases greatly 

 as the season progresses. A dust of undiluted calcium arsenate should be applied 

 to productive fields when 10% of the squares are infested and again 5 and 10 days 

 later. Subsequent applications may be needed if the infestation again increases to 

 dangerous proportions. The dust should be applied on a calm day at a rate of 4 lbs. 

 per acre on young cotton and at 5 to 7 lbs. per acre on large plants, and the treat- 

 ment should be repeated if rain falls within 24 hours. 



1942 - Gaines, R. C. Effect of boll weevil and cotton aphid control on yields as shown in 

 a factorial experiment in 1941. J. Econ. Ent. 35(4) :493-495. 



Factorial experiments in South Carolina, Florida, Louisiana, and Texas, in 

 1941, to determine the comparative effect of treatment with calcium arsenate dust 

 for the control of Anthonomus grandis Boh., with nicotine against Aphis gossypii 

 Glov,, and of a combination of the two treatments on infestation and yield of cot- 

 ton. The nicotine was applied in a spray at the rate of about 2 lbs. of nicotine 

 sulphate (40%) per 100 U.S. gals, of water in Florida and in a dust of tobacco and 

 lime (9:1) to which the nicotine sulphate was added to give a nicotine content of 

 approximately 3% in the other States. 



34 



