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Black rot on ornamental kale

In 2014 there were several occurrences of black rot affecting kale growing in pots for ornamental use on Long Island.  Contaminated seed was concluded to most likely be the source of the pathogen.  Symptoms resembled those associated with systemic infection.  Plants were being grown by ornamental producers who had not seen black rot before, thus there was not a known on-farm source such as contaminated plant debris.  Most plants were receiving in-pot trickle irrigation, thus there was limited opportunity for spread of bacteria via splashing water into the planting, in particular for plants in plantings that were in a greenhouse protected from rain.  Affected plants had diagnostic black veins visible in the petioles and leaves, and diagnostic bacterial streaming was observed from veins in leaf pieces. 

Where found affecting only a few plants being grown in pots, discarding those plants is recommended to minimize opportunity for spread by workers handling plants.  

See black rot on cabbage for more information and photographs.


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