Iron deficiency (Fe)
Iron chloroses have a tendency to occur in the spring, and will show as a yellowing of younger leaves. The discoloration will spread to the leaf blades, while leaf veins stay green. If nothing is done to remedy the situation the symptoms will be aggravated: leaf veins will also yellow, and the leaf blade will die back, beginning at the periphery.
Treatment: One suitable measure to prevent iron chlorosis is to select suitable rootstock. Soil analysis is recommended as a risk assessment tool. During the vegetation period iron sulphate or chelate may be added to the soil, prior to bud burst. Also recommended is foliar application of iron chelates or sulphates (3-4 applications).