Three species of Nectria fungi are associated with beech bark disease in North America. Nectria... Three species of Nectria fungi are associated with beech bark disease in North America. Nectria... All three Nectria species can also form spores by an asexual process. Small white or pink cushions... All three Nectria species can also form spores by an asexual process. Small, white or pink cushions... Symptoms of Nectria infection: Tarry spots are often an early symptom of trees infected by Nectria.... Symptoms of Nectria infection: Tarry spots are often an early symptom of trees infected by Nectria....
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