Family Umbelliferae 357 



EARLY BLIGHT 

 Caused by Cercospora apii Fr. 



Early blight is as common a disease as the late 

 blight. In some seasons of heavy rains it is very 

 destructive. It appears early and affected plants 

 have little value for market purposes. 



Symptoms. The trouble first appears on the outer 

 leaves as pale blotches visible on both sides of the 

 affected parts. The spots are irregular, angular in 

 outline, limited apparently by the leaf veins, with 

 slightly raised borders (fig. 70 a-b). The spots later 

 turn brown to ashy white. 



Control. Early blight may be controlled by spray- 

 ing with Bordeaux mixture as with late blight. The 

 Boston Market and Gold Heart should be avoided 

 because of their susceptibility to the disease. The 

 White Plume seems to be resistant. 



DISEASES OF PARSLEY (Carum petroseHnum) 



DROP, see LETTUCE, p. 143. 



LATE BLIGHT, see CELERY, p. 355. 



DISEASES OF THE PARSNIP (Pastinaca sativd) 



EARLY BLIGHT, see CELERY, p. 357. 



ROOT ROT (fig. 70 c), see RHIZOCTONIA, p. 45. 



WEEDS 



Of the more important Umbelliferous weeds which 

 truckers have to contend with may be mentioned 



