176 



PESTS OF GARDEN AND FIELD CROPS 



bordered with black. In the southwest there are four generations 

 annually. 



Where attack is severe, fields should be mow^ed. Alfalfa that is 

 pastured is much less liable to injury. 



Fig. 203. — Adult of the Imported Cabbage Worm. Original. 



The Imported Cabbage Worm {Pontia rapw Sch.) 



A velvety green worm, an inch to an inch and a half long, eats large, 

 irregular holes in the leaves of cabbage or cauliflower, and disfigures 

 the heads by deposits of excrement. When examined closely, the worm 



is seen to have a faint yellow 

 stripe down the center of its 

 back. 



The adult is the familiar 

 white " cabbage butterfly," 

 often observed hovering over 

 fields of cabbage or cauliflower 

 all through summer. There 

 are from one to four or five 

 -The Imported Cabbage Worm, broods, according to the section 

 Larva on leaf. Original. where found. 



Fig. 204. 



