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blue stain

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noun Plant Pathology.
  1. a serious fungal disease of certain trees that reduces the economic value of the timber, caused by various species of the genus Ceratocystis.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for blue stain

blue stain

noun
  1. forestry a bluish discoloration of sapwood caused by growth of fungi
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012