True Fir: Annosus root rot
True Fir: Annosus root rot categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Annosus root rot decayed wood with black flecksPhoto by: B.M. Johnson Biology Annosus root rot is caused by the fungus Heterobasidion annosum. This native soil pathogen is often in large old tree stumps. It can live several decades […]