Definition of black thread
: a disease of the tapped area of the Para rubber tree that is caused by a fungus (Phytophthora meadii) and that is characterized by black lines extending through the exposed bast into the cambium or wood
— called also black stripe, stripe canker
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“Black thread.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/black%20thread. Accessed 19 May. 2022.
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