Copper deficient plants show dark green and enlarged leaves. Sterns are more slender than normal and appear flat and angular. Limbs die back and gumming may occur under new bark or on fruits. Symptoms are more prominent in young citrus.
Made worst by
Organic soils. Chalky soils. Sandy soils. Reclaimed heathland. High nitrogen applications.
Young trees come into production more rapidly. Vegetative growth is more even. Large foliage area (leaf number) maintained. Fruit mature better (flavour and juice levels enhanced). Premature fruit drop prevented. Fruit skin-quality is much improved.
Copper deficiency on citrus Symptoms of copper deficiency are rarely seen where copper based fungicides are applied.