Is anything resistant to the rhizomorphs?
Yes. Resistant species include: Box elder, Californian black walnut, Yew, Grand and Noble fir, Bamboos, Hombeam, Beech, Ash, Common ivy, Junipers, Larch, Cherry laurel, Oaks, False acacia and Whitebeam. Annual plants and lawns are not affected (although mushrooms could sprout through lawns from rhizomorphs distant from tree roots or from the dead underground roots of infected trees) Herbaceous perennials appear to be rarely attacked and seem to be virtually immune.
