Magnesium Deficiency of Grape
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Magnesium deficiency appears as interveinal chlorosis (yellowing), which may progress to necrosis (browning, tissue death) in severe cases. Symptoms develop in mid- to late summer on older leaves.
Magnesium deficiency on green-fruited grape.
(Photo: John Strang, University of Kentucky)
Magnesium deficiency on red grape.
(Photo: John Strang, University of Kentucky)
Close-up of magnesium deficiency symptoms on red grape foliage.
(Photo: John Strang, University of Kentucky)
Management:
- Monitor nutrient levels through foliar analyses.
- For short-term correction, apply MgSO4 (Epsom salts) beginning after bloom.
- For long-term correction, apply dolomitic lime (if soil pH is below 5.5) or magnesium sulfate, magnesium oxide, or Epsom salts as a band beneath vines.
