WSU Extension

Hortsense

Caption: Shoot tip dieback on arborvitae
Photo by: R.S. Byther
  
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Juniper : Dieback
(revision date: 4/23/2014)


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 optimal for the growth of these plants. They require excellent soil drainage as well as air circulation around the foliage in order to thrive. When soils are saturated, roots become rotten and are unable to absorb sufficient water and nutrients for healthy plant growth. Poor foliar color and dieback often occur as a response to this limited uptake of water and nutrients. Excessive moisture on the foliage can promote dieback and can aggravate other problems.
Management Options

Non-Chemical Management
  • Avoid conditions that promote long moist foliage conditions such as overhead watering, evening watering, and planting too close to a fence. Give plant adequate spacing.
  • Avoid overwatering plants by watering deeply but infrequently. During dry summer months, allow the soil to drain and dry out between waterings.
  • Do not plant junipers in poorly draining soils. Improve drainage when possible.
  • Remove plant debris and bark dust from under plants to reduce humidity and improve air circulation around the plant. Prune plant to promote good air circulation around the foliage and to remove dead foliage detracting from the appearance of the plant.
Select non-chemical management options as your first choice!

Chemical Management


None recommended

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Caption: Shoot tip dieback on arborvitae
Photo by: R.S. Byther