INJURIOUS INSECTS. 



91 



are taken. The worms of the imported species are green in 

 color, while our native species are bluish with yellow stripes. 

 The butterflies of both species are much alike. They are gener- 



Fiff, 35. • Imported Cabbage W^rm.' . fa] ta^vae. (b) Chrysalis, ic) Male 



butterfly. 



ally white with indefinite black marks above and yellow or green 

 markings on the underside, 

 and are commonly seen flit- 

 ting over fields of cabbage or 

 of other of its food plants 

 during the day time. The full 

 grown caterpillar is about 

 an inch and a half long. 

 The winter is passed in the 

 chrysalis stage hidden away 

 in sheltered places and from 



these the adult butterfly emerges in the spring and lays her eggs 

 on the under side of the leaves where they hatch in about one 

 week. There are several broods in a season. 



Remedies. — Pyrethrum powder, mixed with five times its 

 bulk of fiour and dusted into the cabbage just at nightfall is 

 a good rem^edy. The flour should be mixed with the pyrethrum 

 overnight. In a small way hand picking may be successfully 

 resorted to. If the worms are troublesome where cabbage is 

 grown on a large scale it is customary to use arsenical poison 

 mixed with flour as recommended for the potato bug. The poison 

 canuot be applied in" water as it will not stick to the leaves. 



