Pre-bloom applications of zinc can help aid the recovery of winter injured trees and also ensure supplies are not limiting during flowering and new fruit formation, as trials with Empire apples in Us show.
|Bud Burst – Start of Flowering||To optimize bud burst and early leaf development|
|Post Harvest||Replenish reserves and strengthen new buds|
Symptoms occur in the spring and include chlorosis of the youngest shoot leaves, which are stunted and narrower than normal – ‘little leaf’.
Yellowing occurs between leaf veins and is less symmetrical than, for example manganese deficiency. The leaves may show a wavy margin. Blind bud and rosetting can also occur. Leaf symptoms are not strong in apples compared to other fruit trees.
Extreme deficiency results in shoot defoliation and the production of misshapen and poorly colored apples.
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