i9io.] 



Leaf Diseases of Celery. 



ioi I 



Preventive Measures. — The two diseases indicated yield to 

 the same method of treatment, providing preventive measures 

 are commenced at a sufficiently early stage. Spraying with 

 half-strength Bordeaux mixture should be carried out on the 

 first appearance of the disease. Three applications at intervals 



Celery Leaf Diseases. . 



I. — Phyllosticta apii on celery leaf. Nat. size. 



2 and 3.— Perithecium and spores of same. Highly mag. 



4. — Septoria petroselini on celery leaf. Nat. size. 



5. — Section of perithecium of same, embedded in a leaf. Highly mag. 



6. — Spores of same. Highly mag. 



of a week usually prove sufficient to check the progress of the 

 parasite. The injury caused is most serious when the foliage 

 is attacked during an early stage of growth, and careful watch 

 should be kept on the crop, more especially in districts where 

 the disease is prevalent. 



