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blue stain

noun, Plant Pathology
a serious fungal disease of certain trees that reduces the economic value of the timber, caused by various species of the genus Ceratocystis. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for blue-stain

blue stain

(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
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