226 



DIPTEKA OR TRUE FLIES. 



ground. They must not be confused with the Celery -stem 

 Maggot, Piophila apii, although the T. onopordinis larva has 

 been found in the celery stalks. 



Prevention and Remedies. — As -we find the puparia in the 

 leaves and in the ground, we must try to get rid of them 

 in both places, and so effectually stop their increase. The 



^.*r : i'^'* 





£"10. 114. — Celery Fly {TepTiritis onopordinis). 

 1, Imago ; 2, larva, mag.; 3, pupa, nat, size ; 4, leaf mined by iarvse. (Whitehead.) 



leaves should be burnt and the beds dressed with gas-lime 

 in the winter, as after all attacks of garden pests. Spray- 

 ing the young celery plants with paraffin emulsion, every 

 now and then in the summer, keeps off the fly. The old 

 plan of pinching the leaves that are blighted cannot be 

 advised, as the leaves get ruptured and the sap pours out, 

 and thus more damage is done than by the larva. 



