Image Number: 1402100

Boron (B) deficiency is rare but is more likely to occur at soil pH above 6.2, especially on sandy soils following periods of high rainfall and/or rapid growth. Initially, the bud leaves become light green and distorted. In advanced stages, the terminal bud dies and the remaining leaves become abnormally thickened and tend to curl downward. Lower leaves become turgid and brittle as indicated by breaking of the midrib, which may cause leaf drop. The tissue of the broken midrib may be darkened.
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Image location:
United States


Kingdom: Other damage agents
Phylum: Other damage agents
Class: Other damage agents
Order: Abiotic
Family: Nutrient deficiency
Subject: boron deficiency


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
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Image uploaded:
Sunday, March 10, 2002
Image last updated:
Thursday, July 21, 2011