274 The Spraying of Plants. 



CELERY. 

 FUNGOUS DISEASES. 



Celery Blight; Rust; Sun-scald (Cercospora Apii, Fries). 

 Description. The first indication of celery blight is the appear- 

 ance of small, yellowish spots upon the leaves. They rapidly 

 enlarge, run together, and finally cause the destruction of the 

 leaf, which first turns yellow and then brown. The disease is 

 more serious in dry locations, especially if the sun is allowed to 

 shine freely upon the foliage. 



Treatment. The crop should be grown only in moist localities, 

 and there it naturally grows to its greatest perfection. If grown 

 on high land, shade is desirable; if it can be obtained from a 

 building so much the better, as trees and other growing plants 

 rapidly dry out the ground in their immediate vicinity. In 

 case the plants cannot be kept free from the disease by these 

 means, the application of any standard fungicide will almost 

 entirely prevent its appearance. 



Leaf Blight (Septoria Petroselini var. Apii). Description. All 

 parts of the celery plant except the roots suffer from this fungous 

 disease. Watery areas appear on the stems and leaves, and 

 these soon show many small black dots which contain the 

 spores or reproductive bodies of the fungus. The disease is 

 very common in seed-beds, and may be carried over on the seed. 



Treatment. The first precaution to take is to plant only clean 

 seed. That which is speckled or spotted with the above-men- 

 tioned black dots should be avoided as much as possible. If, in 

 addition, the young plants are sprayed with a good fungicide 

 the disease should not become serious. Such applications 

 should be repeated whenever the condition of the plants seems 

 to demand it. 



INSECT ENEMIES. 



Celery-caterpillar. See under PARSLEY. 



CHERRY. 

 FUNGOUS DISEASES. 



Brown Rot (Monilia fructigena, Pers.). This disease and its 

 treatment are fully discussed under PEACH. The cherry does 



