ARSENATE OF LEAD FOR TOBACCO HORNWORMS. “id 
£ 
\N 
Fic. 2.—Amount of leaf surface of tobacco eaten by hornworms from time of hatching to completion 
of growth. 
A represents one-sixteenth of the amount eaten in the first 9 days; B represents one-sixteenth of the 
amount eaten in the last 10 to 11 days. 
During the first 9 days of its life the tobacco hornworm eats about 72 square inches of leaf surface, while 
during the last 10 to 11 days of its life it eats about 1914 square inches—25 times the amount eaten during 
the first 9 days. This statement should suggest the proper time for applying arsenate of lead to tobacco, which 
is while the worms are small—that is, while they are easy to kill and before they have done much damage to the 
tobacco. Repeat the application as soon as numbers of small worms appear upon the tobacco. 
