True Fir: Current-season needle necrosis categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Current-season needle necrosisPhoto by: R.S. Byther Biology Current-season needle necrosis affects noble fir and grand fir. The cause is unknown, but appears to be a cultural problem due to a mineral deficiency. Shortly after growth begins, the current […]
True Fir: Flowers categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Fir flowersPhoto by: R.S. Byther Biology Old, spent flower parts remaining on twigs can be misinterpreted as a disease or insect problem or an unusual growth anomaly. Management Options Use Integrated Pest Management (IPM) for successful plant problem management. Non-chemical […]
True Fir: Grovesiella canker categories: Conifers Ornamentals True Fir True Fir Diseases revision date: 2023-02-07 12:00 Fir Grovesiella cankerPhoto by: R.S. Byther Biology Grovesiella canker is a fungal disease found mainly on the lower branches and stems of young trees or the lower branches of older trees. Sunken, dead areas develop on one-year-old and older […]
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, […]
True Cedar (Cedrus): Needle blight categories: Conifers Ornamentals True Cedar revision date: 2023-02-08 12:00 Shoot needle blight on cedarPhoto by: R.S. Byther Biology Certain fungi have been associated with needle blight on Atlas and Deodora cedars. In spring, infected needles turn a tan-pink color. The blight may be only on the new shoots or may […]