black line
noun
: a nonparasitic disease of walnuts especially of English varieties grafted onto black walnuts that appears to be associated with incompatibility between certain stocks and is characterized by a black line of dead tissue at the graft union, later dying of the bark below, and subsequent decline and death of the tree
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“Black line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/black%20line. Accessed 25 Nov. 2024.
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