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Phomopsis blight of juniper is a foliar disease discovered in 1917 [1] caused by the fungal pathogen Phomopsis juniperovora.The fungus infects new growth of juniper trees or shrubs, i.e. the seedlings or young shoots of mature trees.
Removing all junipers within the 4–5 miles (6.5–8 km) would provide complete control of the disease. [10] Additionally, pruning and disposing of galls from infected cedar trees would reduce sources of inoculum for infection of apple trees, however this would likely be time consuming and uneconomical. [ 6 ]
The most direct method of control is to exterminate juniper hosts near pear trees, though spores can travel at least 6 km from one host to another. If there is a chance of infection, spraying pear trees with a fungicide in spring and summer (typically a systemic one that is certified as capable of dealing with rust) may help, although this is ...
However, leaf spots may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms. Blights are often named after their causative agent. For example, Colletotrichum blight is named after the fungus Colletotrichum capsici, and Phytophthora blight is named after the water mold Phytophthora parasitica. [11]
Pathological pruning, in which all lower branches are pruned regardless of signs or symptoms of infection, may reduce disease instance in white pine tree stands. [ 14 ] Furthermore, genetic hybridization testing has been conducted for more than half a century in order to find resistance among strains of the species, and have since successfully ...
Some junipers are susceptible to Gymnosporangium rust disease and can be a serious problem for those people growing apple trees, an alternate host of the disease. Juniper is the exclusive food plant of the larvae of some moths and butterflies, including Bucculatrix inusitata, juniper carpet, Chionodes electella, Chionodes viduella, juniper pug ...
Other symptoms include stunting, chlorosis or yellowing of the leaves, necrosis or tissue death, and defoliation. Internal vascular tissue discoloration might be visible when the stem is cut. [2] In Verticillium, the symptoms and effects will often only be on the lower or outer parts of plants or will be localized to only a few branches of a ...
This mistletoe parasitizes species of juniper, including Utah (Juniperus osteosperma), Rocky Mountain (J. scopulorum), and western juniper (J. occidentalis). [ 3 ] It is a shrub producing many erect and spreading yellow-green branches 20 to 40 centimeters long from a woody base where it attaches to its host tree, tapping the xylem for water and ...