Chlorosis

Chlorosis is a condition in which plant foliage produces insufficient chlorophyll. When this happens, leaves do not have their normal green color; they may be pale green, yellow, or yellow-white. The affected plant has little or no ability to manufacture carbohydrates and may die unless the cause of its chlorophyll insufficiency is treated. Certain nutrient deficiencies (often aggravated by high pH) produce chlorosis, which may be corrected by supplemental feedings of iron, magnesium or nitrogen compounds in various combinations.