brown root rot

noun

Definition of brown root rot

1 : 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
2 : a disease of tobacco and other plants comparable to brown root rot of fungus origin and believed to be caused by attack of meadow nematodes

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of very fine texture or delicate form

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