104 



VEGETABLE GROWING PROJECTS 



Such plants when pulled have only a tap root devoid of the 

 usual fibrous growth. The injury may be accompanied with more 



or less decay of the 

 tissues where older 

 maggots have tun- 

 neled the root. 



The parent is a 

 two-winged fly which 

 deposits eggs on the 

 ground close to the 

 stem along which 

 the newly hatched 

 maggots work their 

 way to the more 

 tender roots. Two 

 to four generations 

 may occur annually, 

 and, in the fall, eggs, 

 larvse, and adults 

 may be found in the old cabbage stumps. 



CoUtrol : Tar paper disks placed around plants at setting have 

 proved valuable protectors. (CL : 33.) Crude carbolic acid emul- 

 sion is said to reduce maggot injury where early plants have not 

 been protected. (CL r 33.) Protection for late cabbage can be 

 provided by screening the seed bed with cheesecloth. (CL : 35.) 

 Imported cabbage worm : The familiar white butterfly with 

 fore wings grayish tipped is the parent of our common green cab- 

 bage worm. The caterpillar, a velvety green " worm," is dis- 

 tinguished from closely related forms by a faint yellow line along 

 the middle of its back. 



The caterpillar eats large irregular holes in the leaves, often 

 leaving nothing but the larger veins. 

 The adult deposits yellow, delicately ridged eggs on the under 



Fig. 29. — Wilting due to cabbage maggot. 



