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The following 2 entries include the term brown root.
brown root disease
noun: a disease of numerous plants (such as cacao, coconut, tea, or rubber) throughout the eastern tropics caused by a fungus (Hymenochaete noxia) and characterized by defoliation and incrustation of the roots with masses of earth and stones held together by brownish fungal threads
brown root rot
noun: a disease that most frequently affects plants of the pea, potato, and cucumber families, is caused by a fungus (Thielavia basicola), and is characterized by brown to blackish discoloration of the roots and stem base accompanied by decay of these parts
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Merriam-Webster unabridged
