RT Journal Article SR Electronic T1 Norway Maple Decline JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 38 OP 42 DO 10.48044/jauf.1981.010 VO 7 IS 2 A1 Manion, Paul D. YR 1981 UL http://auf.isa-arbor.com/content/7/2/38.abstract AB Norway maple deterioration in urban areas is a major problem. An array of tree characteristics, site factors, climatic factors, and biotic factors are involved in the deterioration in a decline type syndrome.