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.
Causes
Zinc deficiency (right)
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.
Raspberry: 0.5 at green bud. Water rate: 200 to 500 l/ha.
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