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thread blight

American  

noun

Plant Pathology.

  1. a fungal disease of woody plants, characterized by thick, threadlike strands of mycelium on the undersides of the leaves and branches.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.