120 FRENCH MARKET-GARDENING 



dead or yellow leaves are picked off the plants before 

 the work begins. 



Diseases. The worst disease of Celery is caused by 

 the Celery Fly (Tephritis Onopordinis), the maggots of 

 which enter the tissues of the leaves and destroy them, 

 causing unsightly blotches. The best way to check 

 the pest is to syringe the healthy young plants fre- 

 quently with the paraffin emulsion wash mentioned 

 above under Cauliflowers (see p. 115). 



CELERIAC OR TURNIP-ROOTED CELERY 



Celeriac (Apium graveolens rapacea) is known in 

 French gardens as " Celeri rave " (fig. 31), and differs 



from the ordinary 

 Celery in having 

 swollen stems. 

 These are cut up into 

 slices and used in 

 salads, and for 

 flavouring soups, etc. 

 For early crops seeds 

 are sown at the end 

 of February or early 

 in March. The 

 young plants will be 

 ready for pricking 

 out in April, either 

 on an old hot-bed 

 or on a warm south border, allowing 3 or 4 in. 

 between them every way. Three or four weeks 

 later, the young Celeriacs may be pricked out again 

 in similar situations, this time about 6 in. apart. 



FIG. 31. CELERIAC OR TURNIP-ROOTED 

 CELERY. 



