A disease of plants caused by fungal infection of the water-conducting vessels (hadrom/xylem), which blocks nutrient transport.
From hadrom (water-conducting tissue) + Greek myco- (fungus) + -osis (disease condition). It's a technical plant pathology term describing fungal vascular infections.
Hadromycosis is why gardeners fear Dutch elm disease—fungi clogging a plant's water pipes is like a heart attack for trees, and the plant simply dies of thirst from blocked vessels.
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