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1. A hosta under attack from the fungus Sclerotium rolfsii. Note collapsing, yellowing leaves around the outside of the plant. The outer leaves on divisions are always attacked first.

2. A close-up of the base of a plant being attacked by Sclerotium rolfsii. This fungus attacks just at and slightly below the soil line. Note fine white weblike material (mycelium) and the formation of small seedlike bodies (sclerotia). Be careful not to spread the sclerotia when cleaning up the plant, as these can act like seeds to spread the fungus.


3. A close-up of the destroyed petiole of a hosta attacked by Sclerotium rolfsii. Note that all petiole tissue is dead and rotting. Both mycelium and sclerotia can be seen.   4. The first signs of an attack by Sclerotium rolfsii. These lesions appear on petioles at or near the soil line. A hole running into the interior tissue can clearly be seen. The fungus penetrates and completely kills the tissue at the soil line.