194 INSECTS AFFECTING THE CABBAGE. 



When full grown (a), they are about an inch long, of 

 a general pale-green color, with longitudinal lighter 

 stripes : the head is small, and the body gradually 

 enlarges from the front backward. In motion the 

 body assumes a looping position, as shown in the 

 figure. The full-grown larva spins a slight, white, 

 silken cocoon on the cabbage leaf, generally on the 

 lower surface, and within this changes to a brownish 

 pupa, (b). In a short time it emerges as a moth. 

 At the South, where this insect is ordinarily more 

 destructive than at the North, there are several 

 broods each season. The moths are nocturnal or 

 crepuscular, but in cloudy weather are sometimes 

 seen flying during the day. 



The larvse of the Cabbage Plusia are subject to 

 the attacks of many enemies: they are devoured by 

 birds, destroyed b}' certain parasitic insects, and often 

 become the victims of a fungous disease. 



Remedies. — This insect is more difficult to destroy 

 than the Imported Cabbage Worm, but it will suc- 

 cumb to pyrethrum if not diluted with more than 

 three times its bulk of flour, and may also be killed 

 with the kerosene emulsion applied in a spray. 



The Zebra Caterpillar. 



Cera mica picta. 



This caterpillar is at once distinguished from other 



larvse feeding upon cabbage by the brilliant yellow 



and black markings upon its body. It originates 



from small, spherical eggs, laid in clusters upon the 



