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Bean common bacterial blight
Xanthomonas campestris pv. phaseoli and X. fuscans subsp. fuscans
Synonyms
 
  • common bacterial blight 

Plant hosts
 
Phaseolus coccineus (runner bean), P. lathyroides (Phasey bean), P. lunatus (lima bean), P. vulgaris (common bean), Calopogonium, Lupinus poyphyllus (perennial lupine), Pisum sativum (pea), Vigna aconitifolia (moth beans), and V. umbellata (rice-bean) are all susceptible to bean common bacterial blight.
 

Symptoms
 
Small water soaked spots develop on leaves. The spots enlarge turning necrotic, often with a narrow bright yellow margin that surrounds the lesions. On pods, water soaked spots enlarge becoming sunken, brown lesions surrounded by an ooze of bacterial cells that further spread the disease. The two pathogens, Xanthomonas campestris pv. phaseoli and Xanthomonas fuscans subsp. fuscans cause indistinguishable disease symptoms in the fields.
 
Symptomatic leaf
 
Leaf showing symptoms of bean common bacterial blight.
 
Image courtesy of the University of Massachusetts Extension Service

Transmission
 
In the field,bacterial ooze from leaf and pod lesions spread with water during irrigation or rainfall.  Bacteria can also be mechanically spread on equipment and people.  Bacteria overwinter in infected crop residue and seed. 

Geographic distribution
 
Bean common bacterial blight is distributed worldwide.
 

Applicable regulations
 
603-052-0385, Control Area Order: Bean disease 
 
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