38 DISEASES OF CROPS. 



The Carrot Milliped {Julus terrestris, Fig. 15) is 

 one of the so-called "false ■wire-worms," and is one of 

 the largest British species. It attacks carrots, parsnips, 

 and other root crops. 



The Juli undergo a sort of metamorphosis, coming from 

 the egg either quite destitute of feet or furnished with 

 only three pairs of these organs. According to Dr. Savi, 

 the Juli occupy two years before the sexual organs are 

 perfected. 



Prevention and Cure. — Green manuring with buck- 

 wheat destroys this pest. 



The Carrot Moths {Depressaria daucella, De- 



Fig. 15. — " Caeeot Milliped" (Julus teirestris). 

 Nab. size. 



pressaria depressella, and Depressaria cicutella) lay 

 their eggs on the foliage of this crop, and the caterpillars 

 damage the leaves and the heads of the flower. " When 

 disturbed they drop to the ground, and after a time, by 

 means of a gossamer thread left for the purpose, they re- 

 turn and renew their depredations." The caterpillars of 

 the two first-mentioned species feed on the flowers and 

 seeds of the carrot plants. The larvaB spin webs so as to 

 fasten the umbels together, and then regale themselves, 

 destroying the flowers of the host-plant. The caterpillars 

 of both D. daucella and D. depressella are greenish-grey in 

 colour. The former are about half an inch and the latter 

 a quarter of an inch long. When full-grown, both species 

 change to the pupal stage in the flower-heads, or they 



