INJURIOUS TO CABBAGE AND RELATED CROPS 



Fig. 2. — Full-grown imported 

 cabbage worm (X 1|). 



heading, the c'ater])illars often burrow rather deeply into tlie 



head in search of the tenderest leaves. They become full 



grown in ten to fourteen days. 



The mature caterpillar (Fig. 2) is 



about an inch in length, velvety 



green in color and marked with a 



greenish yellow stripe down the 



back and an interrupted one on 



each side. When ready to pupate, 



it seeks some sheltered place — 



under a cabbage leaf or on the underside of fence boards — 



in which to transform to the chrysalis. When a cabbage 



patch is near a house, these 

 chrysalids are often found in 

 great numbers under the edge of 

 the clapboards. When about to 

 transform, the caterpillar first 

 spins a carpet of silk over the 

 surface chosen and fastens a deli- 

 cate silken girdle around its 

 body at the first abdominal seg- 

 ment, holding itself tightly in position (Fig. 3). After the 



transformation is complete the chrysalis is held in place by 



this girth. The pupa (Fig. 4) 



is about f inch in length and 



of a pale green or yellowish 



brown color. Except in the 



case of those chrysalids which 



winter over, transformation to 



the butterfly takes place in a 



week to tw^elve days. The 



butterfly has an expanse of 



about If inches. The wings are nearly white in ground color 



often more or less suffused with yellowish. The tip of the 



Fig. 3. — Imported cabbage worm 

 suspended for pupation (X 1§). 



4. — Chrysalis of imported 

 cabbage worm (X 2 1) . 



