Pine: Sequoia pitch moth categories: Conifers Ornamentals Pine Pine Insects revision date: 2023-02-07 12:00 Sequoia pitch mothPhoto by: S.J. Collman Biology The larvae of the sequoia pitch moth feed by boring into branches or trunks. At the point where the larva enters the wood, small to large masses of white to pinkish pitch accumulate. The […]
Pine: Spider mites categories: Conifers Ornamentals Pine Pine Insects revision date: 2023-02-09 12:00 Spider mites under microscopePhoto by: L.K. Tanigoshi Biology Spruce spider mites feed on older needles, causing yellowish to gray stippling (tiny spots) and needle chlorosis or yellowing. Fine webbing is usually present on infested needles and twigs. The mites are tiny and […]
Pine: White pine weevil categories: Conifers Ornamentals Pine Pine Insects revision date: 2023-02-07 12:00 White pine weevil damagePhoto by: A.L. Antonelli Biology White pine weevils are brown beetles with light blotches on the highly curved back. Adults grow to about 1⁄4″ long and feed on shoots and needles of pines and spruces. The larvae feed […]
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 […]