222 VEGETABLE FOES AND DISEASES 



burned, as once sickly they seldom form good roots 

 afterwards, and infected Carrot beds should be 

 thoroughly cleared of roots in the autumn, dressing 

 the land with gas lime. 



Carrots from seed sown in July seldom contract 

 the disease, and the produce is very serviceable for 

 winter use. 



THE ILLUSTRATIONS REPRESENT CARROT FLY AND ATTACK ON 

 CARROTS. 



A, Carrot Fly : a, natural size ; b, enlarged three diameters. B, 

 krva, commonly called grub, of Carrot Fly : <r, natural size ; 

 d, magnified three times. C, pupa, sometimes called fly-case : 

 <?, natural size ; f, enlarged three diameters. D, attack on 

 Carrots in early stages of growth : g f on the short varieties, or 

 Early Horn section, the lower part being rusted or eaten 

 away ; h y on the long varieties or Long Horn, James' Inter- 

 mediate, and Long Red Surrey, the lowest part or radicle being 

 destroyed as well as other portions of top root or Carrot rusted. 

 E, attack on Carrots when of usable size : /', on short Carrot, 

 the grub gnawing galleries on the surface, producing a scabby 

 rusty appearance, and eating into the substance of root, spoil- 

 ing it for use ; j 9 in long Carrot, with two grubs partly out 

 of flesh. 



CELERY FLY. (Nephritis onopordinis.) 



The Celery Fly is very small, one-eighth to three- 

 sixteenths of an inch in length with a wing expanse of 

 nearly or quite half an inch. It is tawny brown in 

 colour, with the under part of the body light coloured, 

 wings iridescent, with oblique lines of brownish spots 

 running through them ; legs dark yellow, and covered 



