1. UC IPM
Angular, tan, old spots on celery leaf with bacterial leafspot, <i>Pseudomonas syringae</i> pv. <i>apii</i>, with a 1 cent coin for size comparison.
Angular, tan, old spots on celery leaf with bacterial leafspot, Pseudomonas syringae pv. apii, with a 1 cent coin for size comparison.
Credit: R. Michael Davis