170 



PESTS OF GARDEN AND FIELD CROPS 



1 ounce, water 1 pint, and molasses or honey to sweeten. Fall plow- 

 ing will kill large numbers of the larvae in the soil. 



Fig. 192. —The Celery Caterpillar. Original. 



The Celery Caterpillar (Papilio polyxenes Fab.) 



Leaves of celery, parsnips, and other plants of the same family 

 are eaten by a large, naked worm, bright green or yellow, and strikingly 



Fig. 193. — Adult of the Celery Caterpillar. Slightly reduced. Original. 



banded with velvet black. The adult is commonly known as the 

 black, swallow-tail butterfly. There are two generations in the North, 

 and three or four in the Southern states. 



Usually the worms are easily controlled by knocking them from the 

 leaves and crushing them. When excessively abundant, they may be 



