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Magnesium deficiency symptoms typically show up on older leaves as light green blotches between veins, progressing toward the leaf margins. Blotches turn tan and then brown in color; most affected leaves drop from trees.

Magnesium deficiency (Kushad, University of IL)
Magnesium deficiency.

(Photo: Mosbah Kushad, University of Illinois)

   

Management:

  • Monitor tree magnesium levels through foliar analysis and apply dolomitic lime to soil if a pH increase is needed
  • Apply magnesium sulfate (Epsom salt) to foliage and/or soil, or apply magnesium chelate or magnesium oxide to foliage

    

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