True Fir: Balsam twig aphid categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 12:36 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 Large and bluish-gray […]
True Fir: Balsam woolly adelgid categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 12:43 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 on the twigs, […]
True Fir: Coneworms categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-29 12:46 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. They may also […]
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 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 and nymphs begin […]
True Fir: Spruce budworm categories: Conifers Ornamentals True Fir True Fir Insects last review date: 2026-01-27 02:46 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 color with a […]
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 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. It can live […]
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 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 soils or soils […]
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 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 after growth begins, […]
True Fir: Flowers categories: Conifers Ornamentals True Fir True Fir Diseases last review date: 2023-02-07 12:00 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) in the Landscape” […]
True Fir: Grovesiella canker categories: Conifers Ornamentals True Fir True Fir Diseases last review date: 2026-01-29 01:10 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 develop on one-year-old […]