Xanthomonas arboricola pv. juglandis
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Xanthomonas arboricola pv. juglandis (Pierce 1901) Vauterin et al. 1995
The bacterium is wide-spread and causes walnut blight. The symptoms include sunken black spots with chlorotic margins was well as apical necrosis on the fruits leading to fruit rot. Infected leaves show necrotic spots and cankers may develop on the trunks and the branches. Developing fruits often drop prematurely and yield losses can reach 50% or more. For management, copper compounds are mainly used. However, some strains are resistant to copper.
Xanthomonas campestris pv. juglandis
Xanthomonas juglandis pv. corylina see Xanthomonas arboricola pv. corylina.