Iron Deficiency
When plants are deficient in iron, symptoms include interveinal chlorosis on the newest leaves, where leaf tissue turns yellow while the veins remain green, because iron is an immobile nutrient in plants. In severe cases, young leaves may turn nearly white and develop marginal scorch or necrosis. Iron deficiency is often confused with manganese deficiency, which also causes interveinal chlorosis but tends to show small necrotic specks, and with sulfur deficiency, which causes more uniform yellowing of young leaves without strong vein contrast
Certain cultural factors, such as high pH, overwatering, low temperatures, and nematode infestations on roots, may cause identical symptoms. These conditions can inhibit the plant's uptake of iron, leading to iron deficiency even when soil iron levels are adequate.
