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Black Rot of Crucifers
(Xanthomonas campestris pv. campestris)

Blackened veins can be seen in stems and leaf petioles by cutting crosswise.

Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

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Link to the Factsheet on Black Rot of Crucifers

Link to the Photo Gallery on Black Rot of Crucifers