Abstract

Smith, Elton. 1975 Preventing pin oak chlorosis. Woodlands Magazine Vo. 13, no. 1.

Studies have been conducted at the Ohio State University during the past several years to determine the most effective method of preventing chlorosis of pin oak. Included among the iron source treatments were spraying of the foliage, treating the soil, injecting the trees, and trunk implantations. Although all treatments resulted in increasing the iron levels in the foliage to some degree, the most effective from a visual response and increased foliage iron levels was the trunk implantation treatment of ferric ammonium citrate marketed as Medicap. Spraying the foliage resulted in only temporary effects, soil treatments were slow to react and often failed to result in desired visual response. Trunk injections of ferrous sulfate were effective for one season while the trunk implantations remained effective for three years.

• © 1975, International Society of Arboriculture. All rights reserved.