Leaves are often scorched and curled and sometimes mottled and discolored. Young leaves are affected first. Excess boron may cause scorched leaf edges similar to potassium or magnesium deficiencies. Zinc, Zn, is necessary for the production of proteins and affects plant size and maturity. Zinc deficiency causes leaf yellowing between the veins, usually with purple or dead spots starting with the older leaves.
Leaves are close together, small and deformed.
Fruiting is reduced. Excess zinc may cause iron deficiency. Copper, Cu, is necessary for the production of proteins and is important for reproduction. Copper deficiencies causes bluish green leaves which may wither or fail to unfold. Younger leaf tips may be yellow at the edge.