Blackish, necrotic florets of broccoli with broccoli head rot, or black rot, Xanthomonas campestris pv. campestris, which developed after a frost.
Blackish, necrotic florets of broccoli with broccoli head rot, or black rot, Xanthomonas campestris pv. campestris, which developed after a frost. Credit: R. Michael Davis
