METHODS OF CONTROLLING TOBACCO INSECTS. 



depositing eggs in 3 or 4 days. Those that pupate after the 10th of 

 August will usually hibernate, and will not emerge as adult moths 

 until the following year. It is not until the third stage of growth — 







: .¥ 



Fig. 8.— Hibernation of Southern tobacco hornworm: c, Pupa in hibernating 

 cell in soil, at the depth at which pupation usually takes place in the stiffer 

 soils; a, cross section of pupal cell viewed from below; b, pupal cell showing 

 entrance hole of larva or "worm." Two-thirds natural size. (Original.) 



that is, about 10 to 12 days after the eggs are deposited — that the 

 larva 1 injure tobacco seriously. In the fourth (fig. 9) and fifth stages 

 one larva will ruin a small leaf of tobacco in a single day. 



