True Fir: Interior needle blight categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Interior needle blightPhoto by: G.A. Chastanger Biology Interior needle blight is found primarily on noble fir in Christmas tree plantings, but may also occur in the landscape. While a fungus has been associated with the disease, other factors […]
True Fir: Needle casts categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Fir needle cast symptomsPhoto by: R.S. Byther Biology Needle casts on true fir are caused by several fungi. Infected trees develop brown or straw-colored needles which drop prematurely. Severely infected trees may have only current-season and one-year-old needles. The […]
True Fir: Phytophthora root rot categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Phytophthora root rot symptomsPhoto 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 […]
True Fir: Rust (Pucciniastrum) categories: Conifers Ornamentals True Fir Diseases revision date: 2023-02-07 12:00 Fir Pucciniastrum rustPhoto by: R.S. Byther Biology Pucciniastrum rusts are fungal diseases. Yellowish spots or blotches appear on the upper side of infected needles. White, tube-like structures are typically found on the underside of last season’s needles in early summer or […]
True Fir: Spruce spider mite categories: Conifers Ornamentals True Fir True Fir Insects revision date: 2023-02-07 12:00 Spruce spider mite adultPhoto by: A.L. Antonelli Biology The presence of spruce spider mites is indicated by yellow or bronzish stippling beginning near the needle bases. Infestations usually begin on older needles of the lower branches and spread […]
True Fir: Rust (Uredinopsis) categories: Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Fir Uredinopsis rustPhoto by: R.S. Byther Biology Uredinopsis rust is a fungal disease. Yellowish spots or blotches appear on the upper side of infected needles. A slight discoloration may first be observed on current-season needles in fall or winter. White, […]