1. UC IPM
Dark, round, tiny, reproductive bodies (pycnidia) of late blight, <i>Septoria apiicola</i>, on a leaf and in pale lesions on a petiole of celery.
Dark, round, tiny, reproductive bodies (pycnidia) of late blight, Septoria apiicola, on a leaf and in pale lesions on a petiole of celery.
Credit: R. Michael Davis