326 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



all of these substances have the disadvantage that they must 

 be brought into actual contact with the worms to kill them. 



The Southern Cabbage Butterfly * 



Before the invasion of the imported cabbage worm this species 

 was the cause of considerable injury from the Middle States 



southward, but it has 

 now been largely replaced 

 and overshadowed in im- 

 portance by the imported 

 species. The male but- 

 terfly is very similar in 

 marking to the female of 

 P. rapce, and would not 

 be distinguished on the 

 FIG. 275. The southern cabbage butterfly: wing. The female is 

 a, larva; 6, pupa. (After Riley.) more heavily marked with 



black, as shown in the figure. The caterpillar is a greenish-blue 

 color with four longitudinal, yellow stripes, and covered with black 

 dots. The habits are very similar to those of the imported cab- 

 bage worm, and the same methods of control should be used. 



The Potherb Butterfly f 



This species is more common in the North and East and is 

 distinguished from its near rela- 

 tives by the wings being uniform 

 white without spots. The larvaB 

 are very similar to those of the 

 imported species and the habits 

 are very similar. Like the south- 

 ern species, though formerly very 

 common and often injurious, this 

 species is now rarely common 

 enough to do much injury and FIG. 276. The potherb butterfly 

 feeds mostly on wild plants. The and caterpillar. (After Harris.) 

 same remedies as for the imported species should be used. 



* Pontia protodice Boisd. Family Pieridce. 

 f Pontia napi Linn. Family Pieridce. 



