136 INSECTS INJURIOUS TO VEGETABLES 



CABBAGE WORMS 

 The Imported Cabbage Worm (Pontia rapce Linn.). — This is 

 the worst of all cabbage pests and one of the most important 

 of all truck insects. It is altogether too well known through- 



Fig. ZZ.—Pontia raps, a, Female butterfly; b. egg: c, larva on cabbage leaf; d, sus- 

 pended chrysalis, a, c, d. Slightly enlarged; b, more enlarged. (Author's illustration, 

 U.S. Dept. Agr.) 



out North America and Europe, and the white butter- 

 fly is quite generally recognized as its parent. The cater- 

 pillar is velvety green and measures, when full grown, about 

 an inch and a quarter, presenting the appearance shown in 

 figure 88, c. The butterfly has a wing expanse of nearly two 

 inches, and is white, marked with black near the tips of the 

 fore- wings. The female {a) has two conspicuous black spots 

 on each fore-wing, the male has only one. This cabbage worm 

 is the bane of every cabbage-grower, and the dread of every 



