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.
Laboratory analyses and examination may be required to further narrow the range of probable causes. But, without this process of elimination and synthesis, probability of making a correct diagnosis is low. This site was developed for the Arizona Cooperative Extension , College of Agriculture , The University of Arizona . The University of Arizona. All contents copyrighted.