Arborvitae: Cypress tip moth categories: Arborvitae Arborvitae Insects Conifers Ornamentals last review date: 2026-02-11 02:18 Arborvitae cypress tip moth damagePhoto by: R.S. Byther Biology The adult cypress tip moth (cypress tip miner) is a silver-tan moth approximately 1⁄4″ in length. The larvae are green, about 1⁄8″ long, and tunnel in the one- and two-year-old shoot […]
Arborvitae: Flat-headed and shothole borers categories: Arborvitae Arborvitae Insects Conifers Ornamentals last review date: 2026-02-12 09:10 Shothole borer infestation holesPhoto by: A.L. Antonelli Biology Flat-headed borer attacks are most severe on declining plants. The 1⁄2″ adults are either brown to metallic gray or black with red or orange markings, depending on species. The larvae mine […]
Arborvitae: Juniper scale categories: Arborvitae Arborvitae Insects Conifers Ornamentals last review date: 2026-02-12 09:40 Juniper scalePhoto by: Unknown Biology Juniper scale is a small, round, white to gray scale with a yellow dot at the center. Leaves, twigs and branches may be attacked. Ssymptoms of scale feeding include loss of normal color and luster of […]
Arborvitae: Juniper webworm categories: Arborvitae Arborvitae Insects Conifers Ornamentals last review date: 2026-02-12 09:47 Juniper webworm damagePhoto by: A.L. Antonelli Biology The adult juniper webworm is a copper-brown moth with white bands on the edges of the front wings. The moth is about 1⁄2″ across. The webworm caterpillar initially feed by mining inside leaves. As […]
Arborvitae: Berckmann’s blight categories: Arborvitae Arborvitae Diseases Conifers Ornamentals last review date: 2026-02-11 02:05 Arborvitae Berckmann’s blightPhoto by: R.S. Byther Biology Berckmann’s blight is a fungal disease of the leaves and small twigs of Oriental arborvitae. Growth at the tips of branches is infected first, turning brown in late spring. As the infection moves down […]
Arborvitae: Cedar flagging categories: Arborvitae Arborvitae Diseases Conifers Ornamentals last review date: 2026-02-11 02:08 Cedar flaggingPhoto by: R.S. Byther Biology Evergreen plants naturally shed some old foliage each year. Stress factors, such as lack of sufficient water, hot winds, construction damage or other root disturbance, poor planting procedures, or recent planting can promote flagging. Brown […]
Arborvitae: Leaf blight categories: Arborvitae Arborvitae Diseases Conifers Ornamentals last review date: 2026-02-12 10:26 Arborvitae Didymascella leaf blightPhoto by: R.S. Byther Biology Leaf blight is a fungal disease. The symptoms typically appear first in late spring as bleached spots followed by brown or black cushion-like fungal fruiting bodies. Infected foliage may be anywhere on the […]
Arborvitae: Shoot tip dieback categories: Arborvitae Arborvitae Diseases Conifers Ornamentals last review date: 2026-02-12 10:56 Shoot tip dieback on arborvitaePhoto by: R.S. BytherPhoto by: R.S. Byther Biology Dieback observed on arborvitae is often caused by cultural or environmental factors rather than pathogenic diseases or insect infestations. Extensive foliar dieback of arborvitae suggests that the site […]
Arborvitae: Twig blight categories: Arborvitae Arborvitae Diseases Conifers Ornamentals last review date: 2026-02-12 11:44 Phomopsis twig blight on juniperPhoto by: R.S. Byther Biology Twig blight is a fungal disease of the leaves and shoots. Young leaves at the tips of shoots are infected first. This can occur any time tender young foliage is available. As […]
Arborvitae: Leafminers categories: Arborvitae Arborvitae Insects Conifers Ornamentals last review date: 2026-02-12 10:51 Arborvitae cypress tip moth damagePhoto by: R.S. Byther Biology Various species of leafminers may attack arborvitae. In general, leafminer damage is very similar to that of the cypress tip moth. Damage is typically limited to tips of twigs, where leaves and twigs […]