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Causal Agent: 

Bacterium (Xanthomonas campestris pv. campestris)

Characteristic Symptoms:
Infected plants first exhibit 1-3 cm of irregular, dull yellow lesions along the leaf margins that expands towards the midrib creating a V-shaped lesion with broad yellow margin and dry brown center.
Leaves defoliate and vascular tissues become dark
Conditions for Disease Development:
The pathogen infects a wide range of brassica crops  and weeds
Warm, humid conditions and temperatures not exceeding 25°C are favorable for the bacterial growth
Early infection of seedlings can result in severe stunting and plant death
Infected transplants, seedbeds, heavy rain or overhead sprinkler/ irrigation water can rapidly spread the bacteria many meters from the infected plant
The pathogen is seedborne and can survive on plant debris and in the soil
Infection is more likely to occur before transplanting, during late flowering and seed maturation
Management and Control:
Use of pathogen-free seeds
Hot water treatment of suspected seed lots at 50 °C (25 min for cabbage, broccoli and Brussels; 15 min for cauliflower, kohlrabi, kale, turnip and rutabaga)
Strict field sanitation and monitoring for early symptoms
Remove infected plants from seedbeds and close monitoring of the remaining plants
Avoid overhead watering and furrow irrigation
Disinfection of tools and equipment after use
Remove volunteer and weedy crucifers that may serve as alternate hosts for the pathogen.
Spray with protective copper-based fungicides (e.g. Cupravit®, Vitigran Blue®, Nordox 50®).


Agriculture and Natural Resources Publication, FSA7549. Diseases of Turnip and Mustard Greens

Compendium of Brassica Diseases by APS (2007)

To view other diseases,  click here.

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