sentences:  Leucostoma kunzei
  
  The plant pathogenic fungus Leucostoma kunzei (formerly "Valsa kunzei") is the causal agent of Leucostoma canker (also known as Cytospora canker or spruce canker) a disease of spruce trees found in the Northern Hemisphere, predominantly on Norway spruce ("Picea abies") and Colorado blue spruce ("Picea pungens").This disease is one of the most common and detrimental stem diseases of "Picea" species in the northeastern United States, yet it also affects other coniferous species.