94 



Control. The tobacco worm may be controlled by the 

 use of Paris green or lead arsenate, the latter as a spray 

 in water at the rate of 2 Ib. in 50 gallons of water, or 

 the former applied dry, in a mixture with lime at the 

 rate of 1 Ib. to 5 or 6 tb. of lime. 



Fig". i03b. Northern tobacco worm. 



Pupa. Natural size. (From U. S. Dept. Ayric.) 



Hand picking is very efficient, because the caterpillars 

 are large enough to be easily seen, and this is not very 

 expensive in localities where labour is fairly abundant. 



Fig. lose. Northern tobacco worm. 



Full-grown larva. Natural size. (From U. 8. Dept. Agric .) 



