Answer: Oak Root Fungus (Armillaria mellea) sustains itself on buried wood (mostly dead roots), but will invade susceptible plants if their roots come in contact with the infected roots. Those most at risk are other trees and some woody shrubs, because of their deep, extensive root systems. Herbaceous annuals and perennials, because their root systems are shallow and non-woody, are generally not affected by Armillaria. Agapanthus and Hemerocallis fall into the category of not being affected by the disease.
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