Veins normal green. Leaf margins may curl downward or upward with puckering effect. Necrosis may suddenly occur between veins. When the external magnesium supply is deficient, interveinal chlorosis of the older leaves is the first symptom because as the magnesium of the chlorophyll is remobilized, the mesophyll cells next to the vascular bundles retain chlorophyll for longer periods than do the parenchyma cells between them. Leaves lose green color at tips and between veins followed by chlorosis or development of brilliant colors, starting with lower leaves and proceeding upwards.
Leaves are abnormally thin, plants are brittle and branches have a tendency to curve upward.
Smaller veins in older leaves may turn brown . Small necrotic spots in older leaves spread from the margins inwards, and finally desiccate the entire leaf blade. Interveinal chlorosis occurring first on the older or midstem leaves, then progressing to the youngest. Other characteristic molybdenum deficiency symptoms include marginal scorching and rolling or cupping of leaves. With molybdenum deficiency, nitrogen deficiency symptoms may developing the presence of adequate levels off nitrate nitrogen in the root environment and high levels of nitrate nitrogen in the plant.