RT Journal Article
SR Electronic
T1 Branches
JF Arboriculture & Urban Forestry (AUF)
JO JOA
FD International Society of Arboriculture
SP 300
OP 304
DO 10.48044/jauf.1980.073
VO 6
IS 11
A1 Shigo, Alex L.
YR 1980
UL http://auf.isa-arbor.com/content/6/11/300.abstract
AB Trees have developed effective defense systems for walling off infections that may enter the trunk through dying and dead branches. As the growth rate of a branch decreases, the trunk wood begins to form a swollen collar around the base of the branch. When pruning, cut as close as possible to the collar, but do not remove the collar.