Follow the manufacturer's recommendations for amount to use. Trunk Injection Tree injection cartridges containing iron offer a semipermanent treatment for iron chlorosis in trees and large shrubs. Treatments, to be effective the season of application, should be made prior to leaf growth in the spring. Foliar Sprays Iron chlorosis can be corrected by spraying the foliage with ferrous sulfate or chelated iron. Repeat applications may be necessary during the growing season.
Foliar sprays provide only short-term relief and are of temporary value.
Based on material developed in 1992. Lawrence K. Forcier, Director, University of Vermont Extension, Burlington, Vermont. University of Vermont Extension and U.S. Department of Agriculture, cooperating, offer education and employment to everyone without regard to race, color, national origin, sex, religion, age, disability, political beliefs, and marital or familial status. Last reviewed April 24, 1998.