TY - JOUR T1 - Defoliation and Secondary-Action Organism Attack: With Emphasis on <em>Armillaria Mellea</em> JF - Arboriculture &amp; Urban Forestry (AUF) SP - 64 LP - 69 DO - 10.48044/jauf.1981.014 VL - 7 IS - 3 AU - Philip M. Wargo Y1 - 1981/03/01 UR - http://auf.isa-arbor.com/content/7/3/64.abstract N2 - Defoliation-induced changes in trees predispose them to attack by secondary-action organisms which can kill the tree. Both physical and chemical changes occur in defoliated trees that enhance the growth and metabolism of secondary-action organisms. Specific interactions of Armillaria mellea and chemical changes in roots of defoliated trees are described. Control strategies are discussed. ER -