Vegetable Disease Identification: Celery Blights

Alan McNab
Professor of Plant Pathology

CELERY: Celery Blights
Full-size Version	Cercospora Blight appears first as yellow spots visible on both sides of the foliage. These spots enlarge rapidly, become ashen-gray in color, take on a dry papery texture, and usually do not have a distinct margin. Black specks do not develop within leaf spots caused by Cercospora A few spots are sufficient to kill a leaf. Similar symptoms develop on stems and leaf petioles.
Full-size Version	Septortia Blight symptoms include a yellowish speckling which turns tan to yellowish gray with time. The spot margins may be slightly darker. Spot size is variable with a maximum diameter of about 1/2 inch. A diagnostic characteristic of Septoria blight is the presence of very small, widely separated black pycnidia (speck-like fungus reproductive structures) associated with, and usually within, spots. Both leaves and petioles are affected.

Copyright Information
This publication is available in alternative media on request.
Penn State is committed to affirmative action, equal opportunity, and the diversity of its workforce.
This was designed and developed by ICT WebDevelopment.
Please e-mail us with your questions, comments, or suggestions at mat1@psu.edu.
Last modified Tuesday, March 6, 2007