HOW TO POISON. 



Use only pure calcium arsenate in the form of a dry powder. 



Apply this only in the dust form. 



Purchase this to conform to the following specifications: 



Not less than 40 per cent total arsenic pentoxid. 



Not more than 0.75 per cent water-soluble arsenic pentoxid. 



Density not less than 80 or more than 100 cubic inches per pound. 



Have your county agent send a sample of your calcium arsenate 

 to the Delta Laboratory, Tallulah, La., for free analysis to make sure 

 that it is satisfactory. 



Use only Idusting machinery especially constructed for cotton 

 dusting. 



Poison only when the air is calm and the plants are moist. This 

 practically means making only night applications. 



Use about 5 to 7 pounds of calcium arsenate per acre for each 

 application. 



Start poisoning when the weevils have punctured from 10 to 15 

 per cent of the squares. 



Keep your cotton thoroughly dusted until the weevils are under 

 control. This usually means about three applications at the rate of 

 one every four days. 



Then stop poisoning until the weevils again become abundant. 



If the weevils become abundant early enough to injure your 

 young bolls, make one or two niore applications late in the season. 



If you have a hea^^y rain within 24 hours after dusting, repeat 

 this application immediately. 



Do not expect to eradicate the weevils. Poisoning merely con- 

 trols them sufficiently to permit a full crop of cotton and you can 

 always find weevils in the successfully poisoned field. 



Keep your cotton acreage low and do everything possible to in- 

 crease your yield per acre, as it costs just as much to poison one- 

 quarter bale per acre cotton as bale per acre cotton. 



Always leave an occasional portion of a cut unpoisoned for com- 

 parison with the adjoining poisoned tract. This will show how 

 much you have increased your yield by poisoning. 



If you are considering poisoning, write the Delta Laboratory at 

 Tallulah, La., for more detailed information; also ask the advice of 

 your county agent. 



DO IT RIGHT OR NOT AT ALL. 



