With time, the symptoms become more pronounced on the older leaves , and they become mottled or yellowish between the veins and scorched at the margins. These progress inward until the entire leaf blade is scorched. Seed or fruit is shriveled. Potassium is phloem retranslocated from old leaves to new growth. Tips and edges of leaves exhibit necrotic spots coalescing into a marginal scorch .
Symptoms proceed from the plant's base upwards with older leaves being affected first.
Reduced growth and wilting of older leaves with development of chlorotic and necrotic spots. Marginal scorching that may progress to general leaf scorching . Intense yellow or purple color in leaves . Molybdenum excess or toxicity in field-grown plants is rarely observed. Plants appear to tolerate relatively high tissue concentrations of molybdenum.