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2 pictures total.
Pestalotiopsis dieback or arborvitae.
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| Severity: | 1.5 out of 5 |
| Frequency: | 2 out of 5 |
| Symptoms: | The fungus attacks foliage that has been injured or weakened by unfavorable weather or growing conditions. Usually, the killed foliage is near the base of the plant and where foliage is relatively dense. The disease usually starts at the tip of the foliage and progresses towards the leaf base. The color of the foliage goes from green to yellowish, then to a dark brown that can look almost black. The pathogen may kill the smaller twigs where the infected needles died. |
| Cycle: | Varies with the fungal species. |
| Management: | Control is to prune out killed foliage and, if necessary the twigs, as soon as possible in the spring. Reduce winter injury by minimizing dehydration. Do not allow snow to accumulate or remain up and around the base of the plant for any length of time - especially during melting. Avoid overcrowding the plants to allow sufficient sunlight and air circulation. During prolonged drought periods, be sure to correctly water the plant to reduce stress. |
| Associated trees: | |
