In eastern Nebraska, pin oak and silver maple frequently show this condition. Chlorosis becomes progressively more apparent on many other kinds of trees and shrubs as one travels west across the state. This is due to increasing soil pH levels. Table I lists some of the trees grown in Nebraska and their preferred soil pH levels. Pin oak leaves with typical symptoms of iron chlorosis.
Chlorotic plants exhibit partial or complete yellowing of the leaves.
More severe symptoms include smaller than normal leaves that turn pale yellow and develop angular brown spots between the veins. Leaf margins may turn brown. The leaf eventually curls, dries up, becomes entirely brown, and falls. If the condition is not corrected, it can cause poor root development, severe stunting, and plant death. Weakened plants also are very susceptible to other diseases and insect infestations.