MAGGOTS ATTACKING THE ROOTS 



119 



Fig. 87. — Work of the Cabbage-maggot 

 in radishes. Original. 



Fig. 86. — Adult of the Cabbage- 

 maggot. Enlarged and natural 

 size. Original. 



by soft, whitish maggots, one 

 fourth of an inch long. When 

 working on cabbage, the mag- 

 gots eat away the root hairs and 

 gnaw into the larger root. Their 

 work is accompanied often by 

 more or less decay of the tissue. 



When working on radishes, they frequently tunnel entirely within 

 and through the fleshy main root, or cause injury of such a 

 nature that a much-branched root is developed instead of a 

 single, sjTnmetrical tap root. 



A hairy, two-winged fly is the parent of the maggots. Eggs are 



laid on the ground 

 near the stem, or on 

 the stem itself, and 

 the young maggots 

 make their way into 

 the ground along the 

 outside of the stem. 



T7 u^ ^ y , ..■ u 1^1 There are two to four 



Fig. 88. — Tool for cutting hexagonal disks. 



Original. generations annually. 



