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Fungus disease that attacks young cannabis seedlings and clones causing the stem to rot at the base – over-watering is the main cause of #1excludeGlossary.
Merriam-Webster Online Dictionary
damping-off (noun) a diseased condition of seedlings or cuttings caused by fungi and marked by wilting or rotting
Damping-Off (Wikipedia)
Damping off (or damping-off) is a horticultural disease or condition, caused by several different pathogens that kill or weaken seeds or seedlings before or after they germinate. It is most prevalent in wet and cool conditions.

seedling rot, seedling blight, seedling wilt, root rot, fungal wilt