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Blackish, necrotic florets of broccoli with broccoli head rot, or black rot, <i>Xanthomonas campestris</i> pv. <i>campestris</i>, 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