Trees affected by iron chlorosis may be made green by foliage applications of iron chelates or similar compounds. This is a temporary measure and does not correct the basic cause, which is a related to poor root uptake in cool wet soils in the spring. Usually two sprays are required. Apply the first about 4 weeks after bloom and the second about 3 weeks later. Apply as a separate spray.
Caution: Some iron chelate sprays may cause severe injury to fruit, especially pears.