True Fir: Balsam twig aphid categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 12:36 Balsam twig aphidPhoto by: A.L. Antonelli Biology Balsam twig aphids feed on needles and buds of firs. Three distinct forms of the balsam twig aphid occur. Aphids may be: Small and yellow green Large and bluish-gray Have […]
True Fir: Balsam woolly adelgid categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 12:43 Balsam woolly adelgid damagePhoto by: R.S. Byther Biology The balsam woolly adelgids feeds on the stems of true firs. White or grayish cotton-like masses, inside which are the purplish-black insects, can be found on the twigs, branches, […]
True Fir: Coneworms categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 12:46 Coneworm larvae on pinePhoto by: K. Grey Biology Coneworms attack trees by boring into shoot tips or stems, especially around wounds, and feeding on the soft bark tissues. Tip dieback may result from coneworm feeding. They may also bore […]
True Fir: Giant conifer aphids categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 01:00 Giant conifer aphids on pinePhoto by: A.L. Antonelli Biology Giant conifer aphids are large (up to 1⁄5″) and dark brown to black in color. They overwinter as eggs on twigs or branches. Adults and nymphs begin feeding […]
True Fir: Spruce budworm categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-27 02:46 Caption: Spruce budwormPhoto by: T.J. Fitzgerald Biology These larvae feed on the buds and foliage and may tie shoot tips together with webbing to make a nest. They are typically green to brown in color with a darker […]
True Fir: Annosus root rot categories: Conifers Ornamentals True Fir True Fir Diseases last review date: 2026-01-29 12:02 Annosus root rot decayed wood with black flecksPhoto 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 […]
True Fir: Armillaria root rot categories: Conifers Ornamentals True Fir True Fir Diseases last review date: 2026-01-29 12:13 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. Armillaria is often found in newly cleared soils or soils which […]
True Fir: Current-season needle necrosis categories: Conifers Ornamentals True Fir True Fir Diseases last review date: 2026-01-29 12:49 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 […]
True Fir: Flowers categories: Conifers Ornamentals True Fir True Fir Diseases last review 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. […]
True Fir: Grovesiella canker categories: Conifers Ornamentals True Fir True Fir Diseases last review date: 2026-01-29 01:10 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 […]