Magnesium Deficiency of Apple
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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.
(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
