10 ARSENATE OF LEAD AGAINST TOBACCO HOKNWOEMS. 



COST OF ARSENA'l'E OF LEAD, 



The special grade of powdered arsenate of lead recommended for 

 use on tobacco will cost about 22 cents per pound at the factory in 

 100-pound kegs. The freight will be about 1 cent per pound, mak- 

 ing the total cost 23 cents per pound to the grower. Therefore a 3i- 

 pound dosage will cost about 80 cents, while a 5-pound dosage will 

 cost $1,15, A 2-pound dosage of Paris green costs from 50 to 55 

 cents, while a dosage of 1^ pounds, which is the smallest which should 

 be applied, will cost about 31 to 35 cents. If the comparative cost 

 of Paris green and arsenate of lead were the only question to be con- 

 sidered, it would be useless to recommend arsenate of lead. The 

 cost, however, for the careful grower should be a matter of strictly 

 secondary consideration. The certainty of not burning the tobacco 

 should more than compensate for the extra cost of this insecticide. 



SUMMARY. 



Paris green frequently burns tobacco very severely, and may 

 reduce the value of the crop as much as 50 per cent in exceptional 

 cases. 



It is impossible to apply an effective dosage of Paris green without 

 risk of burning tobacco, 



Paris green, which is applied in dust form, is used at a dosage of 

 from 1 to 2 pounds per acre. 



Arsenate of lead is safe and effective during rainy weather, while 

 Paris green is dangerous and ineffective. 



It is recommended that arsenate of lead be used against the tobacco 

 hornworms, and that it be applied as a dust or powder. 



The dosage of arsenate of lead in powdered form varies from 3^ 

 pounds per acre to 5 pounds per acre. If applied as a spray, use 3 

 to 4 pounds in 100 gallons of water. 



Arsenate of lead applied in powdered form, as here recommended, 

 must be mixed with a carrier. The best carrier found so far is dry 

 wood ashes, used in a bulk at least equal to the arsenate of lead. 



In applying arsenate of lead use a dust gun having a fan diameter 

 of at least 8 inches. 



Apply arsenate of lead when there is no breeze and when dew is 

 on the plants. 



Approved : 



James Wilson, 



Secretary of Agriculfxire. 



Washington, D. C, Fehmanj 6, WIS. 



additional copies of this publication 

 -ti. may be procured from the Supeeinteniv 

 ENT OF Documents, Government Prmtfaig 

 Oflace, Washington, D. C. , at 5 cents per copy 



