Black Rot

 

 

 

Plant Diagnostic Database

Black Rot (Xanthomonas campestris)

                       
blackrotbroccoli

blackrotcabbagehead

blackrotcauliflower

blackrotcabbage

 

 
  • Hosts
  • Life Cycle

 

 
  • Description
  • Controls

 
                                                                                                                                                                                              
Hosts:

Broccoli, cabbage, cauliflower, brussels sprouts, kale, kohlrabi and other plants in the cabbage family, radish.
Description:
Black rot is caused by a bacterium. It turns young plants leaves yellow, then brown; eventually they die. Older plants begin to turn yellow from leaf edges inwards in a V-shaped pattern; veins turn black. Black rings and yellow ooze are present in cut stems.
Life Cycle:
The bacterium overwinters on seeds and in plant debris. It can remain infectious for up to 2 years. Infection occurs through wounds or natural openings, especially during warm (80-86°F), humid weather. Transmission occurs via insects, water, and/or mechanical means (such as on tools).
Controls:
Cultural:
 Chemical: Mechanical:

Use 2-3 year rotations and destroy infected plants. Grow resistant varieties.

Spray copper if weather is wet.

Treat seed with hot (120° F.) water 30 minutes before planting.

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