8 FARMERS’ BULLETIN 595. 
SUMMARY. 
Paris green frequently burns tobacco very severely, and may 
reduce the value of the crop es 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 without a carrier, 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 34 
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. 
O 
WASHINGTON : GOVERNMBENT PRINTING OFFICH : 1914 
