Yew: Cottony camellia scale categories: Conifers Ornamentals Yew Yew Insects last review date: 2025-12-03 10:06 Cottony camellia scale on yew Photo by: A.L. Antonelli Biology The adult cottony camellia scale is a flat, oval, brownish insect. It is also found on holly and camellia. The scales overwinter on twigs or needles. In the spring, adult […]
Yew: Lecanium scale categories: Conifers Ornamentals Yew Yew Insects last review date: 2025-12-03 10:06 Lecanium scales on twig Photo by: R.S. Byther Biology Lecanium scales are shiny brown insects found on leaves and twigs. Adults are 1⁄8″-1⁄4″ in diameter and roughly turtle-shaped. Crawlers (immature scales) are flatter. Scales produce large amounts of honeydew, a sweet, […]
Yew: Root weevils categories: Conifers Ornamentals Yew Yew Insects last review date: 2025-08-21 04:53 White pine weevil damage on spruce close-up Photo by: C.G. Landgren Biology Root weevil larvae feed on the roots and bark of plants near the crown. The white grubs are found in the soil around the roots. Larval feeding can cause […]
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 […]