Leaf Spots of Grapes
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Leaf spots (Cercospora, Septoria, Isariopsis/ Ppseudocercospora, Pestalotia) are caused by a range of fungi. These minor leaf spots rarely become severe enough to cause yield losses. Well-managed vineyards seldom have leaf spot diseases when fungicides are applied for other diseases.
Pseudocercospora leaf spot.
(Photo: Paul Bachi, University of Kentucky)
Management:
- Promote plant vigor.
- Increase air circulation to encourage drying of plant tissues (pruning, thinning, spacing, and managing weeds).
- Apply fungicides (especially early season fungicides used to control primary diseases).
