106 VEGETABLE GAKDENING. 



both the celery and the parsnip. It appears in late 

 spring and early summer, and deposits its eggs on 

 the under surface of the leaves. The resulting larvae 

 bury themselves in the tissues, and tunnel along, 

 forming passages and large blotches in the leaves. 



Treatment. (1) Force rapid leaf growth, and dust 

 freely with lime and soot, or hellebore, on the under 

 surfaces of the leaves as well as above. (2) A spray 

 once a week with paraffin emulsion may be given. 

 (3) Trace the larvae, and kill them by pressing them 

 between thumb and forefinger. 



Celery Leaf Bust (Septoria petroselini). This dis- 

 ease attacks the leaves of celery, and sometimes 

 parsley, in the form of brown rusty patches. It 

 spreads quickly, and if not checked, seriously injures 

 the crop. 



Treatment. Encourage vigorous growth, and 

 promptly collect and burn all diseased material. 

 Afterwards spray the foliage with Bordeaux Mixture, 

 as recommended for potato disease. 



