16 MANUAL OF VEGETABLE-GARDEN INSECTS 



the surface constructs a tight cocoon into the outer surface 

 of which bits of dirt and sand are incorporated. The cocoon 

 is f inch in length by f inch in width. The pupa is f to J inch 

 in length and has the head and wing-cases dark brown and the 

 abdomen light yellowish brown. The summer broods of the 

 insect spend about ten days in the cocoon but the time in the 

 pupal stage has not been determined. It is probably about 

 six days. There are supposed to be three generations annually. 

 The cross-striped cabbage worm may be controlled by the 

 measures suggested for the imported cabbage worm. 



Reference 

 U. S. Div. Ent. Bull. 33, pp. 54-59. 1902. 



The Cabbage Webworm 



Hellula undalis Fabricius 



Originally a native of the tropical and subtropical regions 

 of the Old World, the cabbage webworm was introduced into 

 the southern United States shortly before 1895 and now ranges 

 as far north as North Carolina and west to Oklahoma, Texas 

 and southern California. It also occurs in Australia and Guam. 

 This webworm attacks cabbage, cauliflower, collard, turnip, 

 radish, mustard, horse-radish and beet and will feed on shep- 

 herd's purse and purslane. It is sometimes destructive to 

 plants in seed-beds. 



In the southern United States, the insect hibernates as a pupa 

 in a compact cocoon of white silk attached to the injured plant 

 near the base or situated just below the surface of the ground. 

 The early seasonal history is very imperfectly known and the 

 number of generations annually has not been definitely deter- 

 mined. The moth has an expanse of about f inch ; the front 

 wings are brownish yellow mottled wnth darker brown; the 



