Spruce: Spruce spider mite categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2023-02-07 12:00 Spruce spider mite damagePhoto by: R. Maleike Biology The presence of spruce spider mites is indicated by yellow stippling near the needle bases, usually on the lower branches and spreading upwards as the mite population increases. Damaged needles may turn reddish-brown. […]
Juniper: Aphids categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2023-02-07 12:00 Giant conifer aphids on pinePhoto by: A.L. Antonelli Biology Aphids on junipers are typically fairly large (up to 1⁄5″ long) black insects with long legs. Aphid feeding weakens plants, causes foliage to turn brown, and may kill twigs and branches or cause premature […]
Juniper: Cypress tip moth categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2023-12-02 09:17 Juniper cypress tip mothPhoto 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 leaves and growing shoot tips. Damage […]
Juniper: Juniper scale categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2024-04-08 11:46 Juniper scalePhoto by: Unknown Biology The juniper scale is a small, round, white to gray scale with a yellow dot at the center. Leaves, twigs, branches, and cones may be attacked. Symptoms of scale feeding include loss of normal color and luster […]
Juniper: Juniper tip midge categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2023-02-07 12:00 Biology Juniper tip midge larvae feed in the tips of shoots, causing them to swell and form green galls. After the larvae have left, the galls turn brown (sometimes reddish) and the tips die back. Symptoms of mining and exit holes […]
Juniper: Juniper webworm categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2023-12-02 09:17 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 caterpillars initially feed by mining inside leaves, then gather […]
Juniper : Leafminers categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2022-11-05 08:05 Juniper cypress tip mothPhoto by: A.L. Antonelli Biology Various species of leafminers may occur on junipers. In general, the damage they produce is very similar to that of the cypress tip moth. Damage is typically limited to tips of twigs, which are […]
Juniper: Spruce spider mite categories: Conifers Juniper Juniper Insects Ornamentals revision date: 2023-02-07 12:00 Spruce spider mite adultPhoto by: A.L. Antonelli Biology Foliage of plants infested with spruce spider mites is often speckled, stippled, or bleached-looking. Severely damaged leaves or twigs may drop. Some species of spider mites produce fine webbing on the plant. They […]
Juniper: Dieback categories: Conifers Juniper Juniper Diseases Ornamentals revision date: 2023-02-07 12:00 Shoot tip dieback on arborvitaePhoto by: R.S. BytherPhoto by: R.S. Byther Biology Dieback observed on juniper is often caused by cultural or environmental factors rather than pathogenic diseases or insect infestations. Extensive foliar dieback of juniper suggests that the site is less than […]
Juniper: Magnesium deficiency categories: Conifers Juniper Juniper Diseases Ornamentals revision date: 2023-02-07 12:00 Biology Magnesium (Mg) deficiency is a result of improper nutrition. A juniper lacking sufficient magnesium develops yellowing or dead foliage in the center and grows slowly. Older tissues are affected first. Magnesium deficiency may resemble damage caused by Phomopsis twig blight. Management […]
Juniper: Pear trellis rust categories: Conifers Juniper Juniper Diseases Ornamentals revision date: 2023-02-07 12:00 Symptoms on Juniperus sp.Photo by: P. Kapitola, Bugwood.org Biology Pear trellis rust is a fungal disease that attacks pear trees and junipers. It is commonly reported on pear leaves in western Washington. Like many rust diseases, pear trellis rust requires both […]
Juniper: Phomopsis twig blight categories: Conifers Juniper Juniper Diseases Ornamentals revision date: 2023-02-07 12:00 Phomopsis twig blight on juniperPhoto by: R.S. Byther Biology Infection by Phomopsis begins with young leaves at the tips of shoots and can occur any time tender young foliage is available. Initially, small yellow spots appear on the scale-like leaves. As […]
Juniper: Phytophthora root rot categories: Conifers Juniper Juniper Diseases Ornamentals revision date: 2023-02-07 12:00 Phytophthora root rot on juniperPhoto by: R.S. Byther Biology Phytophthora root rot is usually a problem only in areas with poor drainage or where flooding occurs. The fungus attacks the roots, which rot and die. The infection moves up into the […]
Juniper: Rust categories: Conifers Juniper Juniper Diseases Ornamentals revision date: 2023-02-07 12:00 Juniper rustPhoto by: R.S. Byther Biology Several types of rusts infect junipers. The alternate hosts for most of the rusts are in the rose family, including plants such as hawthorn, cotoneaster, and apple. Infected junipers develop round or elongate galls on the branches. […]