Symptoms of leaf spot caused by <em>
Xanthomonas campestris </em>pv. <em>armoraciae</em> (left) and <em>X. campestris </em>pv. <em>raphani </em>(right), two bacterial pathogens closely related to the black rot pathogen, <em>X. campestris </em>pv. <em>campestris</em>.

Symptoms of leaf spot caused by Xanthomonas campestris pv. armoraciae (left) and X. campestris pv. raphani (right), two bacterial pathogens closely related to the black rot pathogen, X. campestris pv. campestris.

Photo Source: Lindsey du Toit, Washington State University