Return to Nutrient Disorders


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)



  • 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


Return to Nutrient Disorders