True Fir: Balsam twig aphid Categories: Conifers Ornamentals True Fir True Fir Insects Last review date: 2026-09-29 06:57 Last edit date: Balsam twig aphid Photo 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 […]
True Fir: Balsam woolly adelgid Categories: Conifers Ornamentals True Fir True Fir Insects Last review date: 2026-01-29 12:43 Last edit date: Balsam woolly adelgid damage Photo 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 […]
True Fir: Coneworms Categories: Conifers Ornamentals True Fir True Fir Insects Last review date: 2026-01-29 12:46 Last edit date: Coneworm larvae on pine Photo 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. […]
True Fir: Giant conifer aphids Categories: Conifers Ornamentals True Fir True Fir Insects Last review date: 2026-09-29 06:57 Last edit date: Giant conifer aphids on pine Photo 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 […]
True Fir: Spruce budworm Categories: Conifers Ornamentals True Fir True Fir Insects Last review date: 2026-01-27 02:46 Last edit date: Caption: Spruce budworm Photo 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 […]
True Fir: Annosus root rot Categories: Conifers Ornamentals True Fir True Fir Diseases Last review date: 2026-01-29 12:02 Last edit date: Annosus root rot decayed wood with black flecks Photo 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. […]
True Fir: Armillaria root rot Categories: Conifers Ornamentals True Fir True Fir Diseases Last review date: 2026-01-29 12:13 Last edit date: White fungal mat of Armillaria root rot infecting trunk Photo 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 […]
True Fir: Current-season needle necrosis Categories: Conifers Ornamentals True Fir True Fir Diseases Last review date: 2026-01-29 12:49 Last edit date: Current-season needle necrosis Photo 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 […]
True Fir: Flowers Categories: Conifers Ornamentals True Fir True Fir Diseases Last review date: 2023-02-07 12:00 Last edit date: Fir flowers Photo 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 See “Using Integrated Pest Management (IPM) […]
True Fir: Grovesiella canker Categories: Conifers Ornamentals True Fir True Fir Diseases Last review date: 2026-01-29 01:10 Last edit date: Fir Grovesiella canker Photo 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 […]