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. […]