Arborist News quizzes are available free online to members for one year after the date of publication; a maximum of six quizzes are available at any time. CEU quizzes for older articles may be purchased by both members and non-members.
This article will help readers understand the differences between sapwood, heartwood, and would-initiated discoloration and how each is formed. Additionally, this article will review the relative decay resistance of selected North American trees. 1 CEU (A, U, M, T, L, Bs)
CEUs for this quiz may be earned only once during the life of your certification.