Raspberries
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Raspberries - Deformation
Symptoms
Older leaves are vaulted downward or contorted and show interveinal chlorosis. Deformations have been reported from younger leaves, too. With ongoing deficiency mature leaves display a dark green, later brown marginal discoloration that finally spreads allover the leaf blade. Plant size is reduced.
Reasons
Zinc deficiency
Suggested range is 16-80 ppm in leaf tissue. Zinc content in soils is often good while its availibility is not sufficient. Excessively high soil pH should be avoided.
Zinc deficiency made worse by
- Organic soils
- High pH soils
- Soils rich in phosphorus
- Soils receiving high phosphorus application
- Cold wet conditions
Zinc is important for
- Improved crop development
- Increased yield
- Improved fruit quality