Hemlock Diseases

Hemlock: Annosus root rot Categories: Conifers Hemlock Hemlock Diseases Ornamentals Last review date: 2026-05-18 08:10 Annosus root rot decayed wood with black flecks Photo 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 as […]

Hemlock: Phytophthora root rot Categories: Conifers Hemlock Hemlock Diseases Ornamentals Last review date: 2026-05-18 09:31 Dieback on creeping hemlock due to Phytophthora root rot Photo by: R.S. Byther Biology Phytophthora root rot is usually a problem only in areas with poor drainage or where flooding occurs. The fungus attacks the roots, which rot and die. […]