WSU Extension

Hortsense

Caption: Boron deficiency symptoms on leaves
Photo by: R.S. Byther
  
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Raspberry : Boron deficiency
(revision date: 5/6/2014)


Biology
Boron deficiency affects the level of growth hormones in plant tissue, as well as pollen tube growth. Bud break in the spring is delayed, and many buds die off. Other symptoms include abnormal or uneven shoot growth in the spring, malformed dark blue-green fern-like leaves; small and malformed crumbly fruit, and underdeveloped roots. Fruit ripening may be delayed, and overall yield is significantly decreased. Boron deficiency is relatively common in Western Washington and Oregon.
Management Options

Non-Chemical Management
  • Apply fertilizer containing boron. Spring applications are most effective.
Select non-chemical management options as your first choice!

Chemical Management


None recommended

Images
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Caption: Boron deficiency symptoms on leaves
Photo by: R.S. Byther
Caption: Boron deficiency symptoms on fruit and leaves
Photo by: R.S. Byther