This is another common problem with an arborvitae tree. Similar to other blight diseases pestalotiopsis causes the foliage to discolor from yellow to dark browns and blacks.
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Once an arborvitae is established you don t need to do much to tend it.
Arbor vitae diseases. In most cases the arborvitae will have pre existing conditions and diseases before it is infected with pestalotiopsis blight. Two main types of twig blight occur on arborvitae caused by the fungal pathogens kabatina thujae and phomopsis juniperovora respectively. Causes of disease in arborvitae trees.
Kabatina twig blight mainly occurs on new branches but both diseases can infect arborvitae at the same time. Blight including needle blight caused by pestalotiopsis funerus is probably the most common culprit when your arborvitae comes down with the nasties. One way to prevent this disease from affecting the arborvitae is by wrapping the barks of trees in winter.
Informational table showing disease name symptoms pathogen cause and management of arborvitae diseases. Disease symptoms pathogen cause management. With their pyramidal oval or conical shapes arborvitaes provide dense evergreen foliage that lends itself well to providing shade and protection from wind.
Unfortunately american and oriental arborvitae are considered ice cream by deer and are quite vulnerable to deer browsing especially in the winter months. This pathogen generally attacks plants that are already stressed from other causes such as by pests. When canker diseases spread they tend to kill off one distinct area of bark at a time.
In general arborvitaes exhibit few serious insect and disease problems. These trees have no serious pest or disease issues don t require fertilizer or pruning to thrive and are moderately drought tolerant. Just be sure that the site gets some sun and is large enough to accommodate the tree s full size.
Cankers sometimes take root on arborvitae tree bark after a gouge or other injury has taken place as a result of mechanical injury giving canker producing fungi an opening to infestation. To add to the confusion the symptoms are essentially the same. Save for later print.
The oldest branchlets turn brown in autumn and fall off. Insect infestations physical injury or exposure of the plant or sections of the plant from herbicides or harmful chemicals can lead to die back of evergreen foliage. I have also included a general article that describes the most common causes of non disease or stress related die back in conifers including arborvitae.
This type of problem can cause death and injury to a tree s tissues which leads to damage in the underlying tissues or to the bark of the tree. Pestalotiopsis blight is a fungal disease that only infects relatively weak and ailing foliage.
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