It is used as a coating for iron and steel to prevent corrosion.
Younger leaves show a wide band of yellow bleached tissue and are smaller than normal.
Reddish spots then show up in the yellow tissues. Zinc toxicity is a rare occurrence, and can happen when galvanized tanks or parts are used in a hydroponic system. Zinc is most available in pH conditions from 5.0 to 7.0. Zinc deficiency can be mistaken for leafhopper or root damage. In plants, a small amount of zinc is needed and too much can be toxic.