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When the stems of young plants wither at the soil level and then topple over, they have probably been killed by a disease known as damping off. The culprit is actually pythium, a common fungus. The spores of this fungus require cool, wet soil in order to infect plant tissues. Pythium can also infect seeds as they are germinating, causing seedlings to rot before they make it to the soil surface.
Last updated: 10/24/15
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