Answer: Honey fungus, or Armillaria, spreads from infected plants by direct contact with the roots of neighboring healthy plants and also through the soil by means of the bootlace structures, which can attack the roots of neighboring healthy plants.
Plants under stress, due to poor growing conditions, tend to be more vulnerable but certain genera are more susceptible than others. Members of the Prunus family tend to be vulnerable so I would not recommend planting it. Plants that show resistance to Armillaria include
Acer negundo (but not other Acer species)
Catalpa (Indian bean tree)
Chaenomeles (Japanese quince)
Cotinus (smoke bush)
Juglans nigra (but not Juglans regia)
Passiflora (passion flower)
I hope these suggestions are helpful.
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