3i6 PLANT DISEASES 



Bordeaux mixture, or potassium sulphide solution, which 

 has proved effective against allied fungi, would arrest the 

 spread of the disease. 



Oudemans, NederL Bot. Yen., 1898, p. 527. 



CELERY LEAF BLIGHT 



(Cercospora apii, Fr.) 



During a damp season celery leaves often show pale 

 spots which rapidly increase in size and often cover the 

 greater portion of the leaf. The portion not attacked 



Fig. 85. Cercospora apii. i, celery leaf attacked by the fungus; 

 2, fruit of fungus, x 300. 



turns yellow, and the leaf dies. As a rule the disease 

 spreads rapidly unless checked by a spell of dry weather, 



