Pine: Armillaria root rot categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 White fungal mat of Armillaria root rot infecting trunkPhoto by: C.R. Foss Biology Armillaria root rot is a fungal disease transmitted between plants by root contact or through infected soil. Armillaria is often found in newly cleared soils or soils which […]
Pine: Dwarf mistletoe categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 Dwarf mistletoe in coniferPhoto by: R.S. Byther Biology Dwarf mistletoe is a parasitic plant that grows on the branches of a host tree. It is yellow-green, olive-green, or somewhat orange in color and grows in clusters to about four inches high. The […]
Pine: Elytroderma needle cast categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 Elytroderma needle castPhoto by: R.S. Byther Biology Trees infected with Elytroderma needle cast often display clusters or flags of red-brown needles in the spring. The diseased twigs turn up at the tip. The bases of affected needles often remain green. In […]
Pine: Lophodermella needle cast categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 Lophodermella needle castPhoto by: R.S. Byther Biology This fungal disease infects current-season needles, but symptoms are not found until the following spring. Infected needles turn reddish-brown, and later become yellow or straw-colored. Shallow dimples or depressions can be found on all […]
Pine: Lophodermium needle cast categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 Pine Lophodermium needle castPhoto by: R.S. Byther Biology Lophodermium needle cast is a fungal disease infecting the needles of pines. There are 19 Lophodermium species in the Pacific Northwest. One species of concern, L. seditiosum, infects current-season needles, which are killed by […]
Pine: Phytophthora root rot categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 Phytophthora root rot damage to trunkPhoto 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. The infection moves up into […]
Pine: Western gall rust categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 Western gall rustPhoto by: R.S. Byther Biology Western gall rust affects primarily two- and three-needle pines, including shore, lodgepole, mugo, Scotch, Austrian, and ponderosa pines. This fungal disease causes small to large round or pear-shaped galls on infected twigs, branches, or […]
Pine: White pine blister rust categories: Conifers Ornamentals Pine Pine Diseases revision date: 2023-02-07 12:00 White pine blister rustPhoto by: R.S. Byther Biology White pine blister rust is a fungal disease which attacks all five-needle or white pines. Elongate cankers are formed on trunks and branches. The cankers may ooze resin. In the spring, fungal […]