WSU Extension

Hortsense

Caption: Boron deficiency on walnut
Photo by: R.S. Byther
  
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Holly : Boron deficiency
(revision date: 4/23/2014)


Biology
Boron deficiency in holly is characterized by the appearance of spots on the leaves. The spots initially are red to purple and irregularly shaped on the upper surface. They appear water-soaked on the lower leaf surface. Later, the spots enlarge and may assume a target-like pattern bordered by yellow. Premature leaf drop may also occur. Leaves of boron-deficient plants are often deformed and stunted. Other problems may cause similar leaf spot symptoms on holly.
Management Options

Non-Chemical Management
  • It may be necessary to have the soil tested for boron. Amend the soil as recommended to correct the deficiency. Use caution, as excess boron is toxic to plants.
  • Applying 0.1 lb actual boron to soil in fall around each tree has been effective in 10-year-old plantings. Younger trees require correspondingly less.
Select non-chemical management options as your first choice!

Chemical Management


None recommended

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Caption: Boron deficiency on walnut
Photo by: R.S. Byther