Managing manganese deficiency in nursery production of red maple

Published March 2006. Reviewed May 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalogField-grown red maple (Acerrubrum) trees often develop foliar chlorosis during mid- to late summer. Initially, the condition appears as mild interveinal chlorosis in newly developing foliage. As symptoms intensify, entire leaves turn chlorotic. Under severe conditions, interveinal necrosis occurs. Chlorotic plants often have reduced height and caliper. The chlorosis is most often caused by manganese (Mn) deficiency. Mn is an essential nutrient for plant growth. Several soil properties affect Mn availability and the severity of chlorosis. This publication discusses the importance of Mn in nutrition of red maples in nursery production and explains the combination of soil factors that can cause Mn deficiency and resulting chlorosis. Management\ud guidelines for preventing red maple chlorosis are presented