The symptoms of manganese deficiency vary greatly from one species to the next. Leaves often show an interveinal chlorosis. the veins making a green pattern on a yellow background, much as in early stages of iron deficiency. There may be necrotic spots or streaks on leaves ("grey speck" of oats), and in legume seeds, necrosis may appear in the embryo or the adjacent inner surfaces of the cotyledons. Leaves of some species become malformed ("mouse ear" of pecans). In severe cases, plants are stunted.
Why is Manganese important?